Plan a relaxed Saturday using these options: a park open 9am-6pm, a museum open 10am-5pm, and a cafe open 8am-8pm. Start at 10am, include a lunch break, and allow 30 minutes between stops. Return a timetable without inventing prices or opening hours.
Claude Opus 4 8 API: Online text generation, tutorials and integration guide
Connect to Claude Opus 4 8 in one click on RequestBeam. One API key connects AI and multiple data services, so you can focus on your business and explore new ideas.
Claude Opus 4 8 API pricing and billing
0-1M input tokens
Official price
- Input
-
$5.0000/M - Output
-
$25.0000/M - Cache input
-
$0.5000/M - Cache write (5m)
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$6.2500/M - Cache write (1h)
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$10.0000/M
Our price Save 45%
- Input
- $2.7500 /M
- Output
- $13.7500 /M
- Cache input
- $0.2750 /M
- Cache write (5m)
- $3.4375 /M
- Cache write (1h)
- $5.5000 /M
Claude Opus 4 8 online chat tool
Model settings
It includes completed, reusable turns from this conversation in your next request, so you can ask follow-up questions without repeating the context.
What happens when it is off?Only your new message and any system prompt are sent. Existing messages stay visible; turning memory back on includes eligible earlier turns again.
Is this long-term memory?No. This is conversation context, not memory across separate conversations. Failed, stopped, truncated, or non-reusable replies are excluded. More history can use more input tokens and increase cost.
Advanced parameters
Conversation

How can I help you today?
No response data yet Claude Opus 4 8 prompt examples
Draft a polite customer email for this situation: an order will arrive two days late, the revised delivery date is October 15, and tracking will be sent tomorrow. Apologize without inventing compensation. Include a subject line and keep the email under 120 words.
Turn these meeting notes into an action list: Maya will revise the proposal by Friday; Leo will confirm the venue next Monday; the budget needs approval, with no owner assigned. Use columns for task, owner, deadline, and open questions. Mark missing details as unknown.
What is Claude Opus 4 8?
Claude Opus 4 8 model focus and core capabilities
Claude Opus 4.8 is an Anthropic hybrid reasoning model for coding, agentic tasks, and professional knowledge work. Building on Opus 4.7, it emphasizes collaborative judgment and identifying uncertainty rather than merely presenting a confident result. It can process text and images, but those model capabilities require an appropriate input interface.
Claude Opus 4 8 online tools and API on RequestBeam
RequestBeam provides a text Playground, unified Chat Completions, and Claude Messages for this model. Test a document review, code diagnosis, or constrained analysis before connecting it to your application. This online tool accepts text; native vision and tool use do not give it automatic access to uploads, repositories, browsers, or business systems.
Claude Opus 4 8 capabilities and domain strengths
Use Opus 4.8 where a task needs careful review across several steps: checking a proposal against requirements, finding contradictory rules, and deciding what evidence is missing before recommending a change.
Collaborative judgment and explicit uncertainty
Opus 4.8 places more emphasis on acknowledging unresolved problems than its predecessor. For a technical proposal, ask for confirmed findings, assumptions, and questions that could change the recommendation, rather than a single polished verdict.
Give the assistant boundaries for acceptable changes. It should explain a risk and propose a check, not silently choose a policy, widen the project, or claim that verification succeeded. Review important judgments against the material you supplied.
Code review and multi-step engineering analysis
For a difficult repair, provide the relevant code, observed failure, intended behavior, and tests. Ask for a dependency trace, a minimal patch proposal, and a way to verify it. This makes coding assistance useful beyond generating an isolated function.
Treat any claimed test result as unverified unless your execution environment produced it. This Playground does not inspect local files or run commands; an integrated agent needs controlled tools and feedback to turn a proposal into a checked change.
Document consistency and source-aligned synthesis
Use labeled passages to review onboarding guides, requirements, research notes, or operational policies. Ask for conflicting statements, exact supporting passages, and alternative resolutions that preserve the intended rules.
Opus 4.8 has native image understanding, but this page has no image or PDF upload control. Paste relevant text for a text-based audit. For visual analysis, verify the chosen API input format; a URL in a text message is not proof that its contents were read.
Constrained reasoning and professional review
Separate facts, estimates, and pending decisions when asking for an analysis. Require each recommendation to identify the constraint it addresses and the observation that would invalidate it; this is more useful than an unsupported assurance that a plan is sound.
For legal, financial, or other high-impact material, use the output to prepare questions and organize evidence. Check quotations, calculations, and interpretations with the original records and an appropriate reviewer before acting.
Claude Opus 4 8 benchmarks and performance
Benchmarks and agent demonstrations use specific prompts, effort settings, and execution environments. They do not establish a RequestBeam response-time guarantee or a success rate for your own document reviews and repairs.
Evaluate engineering completion, not fluent explanations
Build a small set of defects with known causes and regression checks. Score whether the proposed repair fixes the failing case, preserves working behavior, and stays within the allowed change scope. Record false findings as well as correct ones.
Evaluate an agent with the tools it will actually receive. A terminal benchmark includes command execution and iterative feedback; a text-only suggestion cannot be graded as if those steps already occurred.
Evaluate document findings and collaborative judgment
Use documents containing known contradictions, missing definitions, and intentionally unresolved policy choices. Count correct locations, quotation errors, overlooked conflicts, and recommendations that unexpectedly change the policy.
Include clean documents so the assistant cannot improve its score by reporting a problem everywhere. Check whether it distinguishes a genuine contradiction from a clarification question and leaves decisions with the responsible owner.
Measure quality, latency, and actual usage together
Keep input, output requirements, and available tools consistent when comparing models. Record time to first answer text, total duration, input and output usage, and the amount of review needed to accept the result.
Long inputs, reusable conversation history, and thinking can increase usage or delay answer text. Start with a small evaluation and adjust the output allowance to the task; a larger allowance is not a guarantee of greater accuracy.
Claude Opus 4 8 compared with Opus and GPT models
Compare models on the work you need to accept, not the version number. The following table defines test cases and review criteria rather than claiming a universal ranking or a controlled RequestBeam benchmark.
| Task | Claude Opus 4.8 evaluation focus | Catalog alternatives | Verification method |
|---|---|---|---|
| Document audit | Locate contradictions without deciding policy | Claude Opus 4.7 / Claude Opus 5 | Known findings, false positives, and rule preservation |
| Code diagnosis | Connect failure evidence to a minimal repair | GPT-5.6 Sol / Claude Opus 5 | Regression tests and patch scope |
| Constrained analysis | Keep uncertain inputs and trade-offs visible | Claude Opus 4.7 / GPT-5.6 Sol | Constraint coverage and unsupported claims |
| Routine extraction | Return source-aligned fields | Claude Sonnet 4.6 | Schema validity, missing fields, and actual usage |
When to prioritize testing Claude Opus 4.8
Prioritize it when review quality includes more than finding an error: the assistant must identify the passage, explain the consequence, preserve the rule, and ask for the decision that cannot be inferred. That is a useful test for collaborative judgment.
Use the same documents with Opus 4.7 and Opus 5, and the same repair tasks with GPT-5.6 Sol. Accept the model that performs reliably under your constraints; a later version is not evidence that every response will improve.
Choose models by workflow on RequestBeam
Compare Claude Sonnet 4.6 for clearly bounded extraction or routine review alongside Opus 4.8 for the difficult cases. Use one grading rubric across models so shorter answers are not penalized merely for being concise.
Check each model page for current account pricing and the supported protocol. Shared authentication and balance do not make Claude content blocks, OpenAI output items, and Chat Completions choices interchangeable.
Why use Claude Opus 4 8 through RequestBeam?
Usage-based billing and model cost optimization
Reliable service at prices lower than official rates. Top up on demand and use what you pay for.
Unified AI models and data APIs, with multi-model access in one place
One API key connects multiple AI models and data services, reducing integration costs and letting you switch with one click. Business applications need both AI and data.
Call logs and application access controls, with clarity on every call
Every API call is recorded in your dashboard. Create separate API keys for different applications.
Model capabilities without compromise
We do not water down our models. We cannot offer you the cheapest, but we are committed to offering you the best.
How to use Claude Opus 4 8 on RequestBeam
After creating an API key in the console, follow the documentation to get started with Claude Opus 4 8.
Prepare your account and test online
Sign in, confirm your balance, and create an API key.
Try it in the Playground
Explore the model's capabilities in the Playground to find the best way to use it.
Integrate Claude Opus 4 8 into your business
Follow our developer documentation to integrate Claude Opus 4 8 into your business.
Future model upgrades
When a new model is released, simply replace the model name with the new one to upgrade.
Claude Opus 4 8 API FAQ
Is Claude Opus 4.8 the same API model as Opus 4.7?
No. The API model name for Claude Opus 4.8 is claude-opus-4-8; the API model name for Claude Opus 4.7 is claude-opus-4-7. They are different models, so do not mix up their model parameters.
Why is thinking empty or the answer incomplete?
Native Opus 4.8 has thinking off by default and supports adaptive thinking when enabled. Thinking may be empty when it is off or the model decides it is unnecessary. For an incomplete answer, check the completion state and output allowance, leaving enough room for thinking and final text.
How should I troubleshoot authentication, balance, or access errors?
Follow the API error documentation to diagnose the issue.
Can I use OpenAI Responses for Claude Opus 4.8?
OpenAI Responses is not supported. Claude has its own Claude Messages format; see the documentation for details.
Can I force a tool call or edit a native Messages conversation?
Native Opus 4.8 supports forced tool_choice types any or tool with adaptive thinking. Follow the documentation for the interface you use. Take care when replaying preserved thinking after editing earlier messages. Keep native assistant content blocks and their signatures intact during tool continuations.
Is conversation memory permanent?
No. The API does not automatically retain conversation context for subsequent requests. Manage the history yourself and include the required context in each request. Long-term memory must be implemented by your application.
Related text APIs
Claude Opus 4 8 API specification and requests
Claude Opus 4 8 API quickstart
claude-opus-4-8Chat CompletionsPOST /v1/chat-completions
curl -X POST "https://api.requestbeam.com/v1/chat-completions" \
-H "Authorization: Bearer <API_KEY>" \
-H "Content-Type: application/json" \
-d '{"model":"claude-opus-4-8","messages":[{"role":"user","content":"Hello, introduce yourself in one sentence."}],"stream":false}'MessagesPOST /anthropic/v1/messages
Messages requires max_tokens. The allowance in this example is editable, not an upstream default or a model limit. Thinking may consume it before any answer text; adjust it for your task and check output costs.
curl -X POST "https://api.requestbeam.com/anthropic/v1/messages" \
-H "Authorization: Bearer <API_KEY>" \
-H "Content-Type: application/json" \
-H 'anthropic-version: 2023-06-01' \
-d '{"model":"claude-opus-4-8","max_tokens":4096,"messages":[{"role":"user","content":"Hello, introduce yourself in one sentence."}],"stream":false}'Family and protocol reference
Claude Messages
Full API documentationNative Claude Messages-compatible API. This endpoint uses Anthropic Messages request and response shapes, including tool calls and Anthropic SSE events.
https://api.requestbeam.com/anthropic/v1/messagesNative Claude Messages-compatible API. This endpoint uses Anthropic Messages request and response shapes, including tool calls and Anthropic SSE events.
POST https://api.requestbeam.com/anthropic/v1/messagesAuthentication
All requests require a RequestBeam API Key. Anthropic SDKs, Claude Code, and compatible clients usually use x-api-key; plain HTTP clients may also use Bearer Token authentication.
x-api-key: YOUR_REQUESTBEAM_API_KEY
anthropic-version: 2023-06-01Authorization: Bearer YOUR_REQUESTBEAM_API_KEY
anthropic-version: 2023-06-01Body
modelstringrequiredDefault: claude-sonnet-4-6Supported Claude model IDs.
claude-fable-5claude-fable-5-1claude-haiku-4-5claude-opus-4-5claude-opus-4-6claude-opus-4-7claude-opus-4-8claude-opus-5claude-opus-5-5claude-sonnet-4-5claude-sonnet-4-6claude-sonnet-5
Use GET https://api.requestbeam.com/v1/models for the models currently available to your API Key.
max_tokensintegerrequiredMaximum number of output tokens, as a positive safe integer. This budget includes both thinking and final text output tokens. Missing, zero, negative, fractional, string, or unsafe-integer values return HTTP 400 with invalid_request_error before generation or billing. The model may impose a lower maximum.
For models that produce thinking, a small budget such as 128 may yield only thinking blocks before ending with stop_reason: "max_tokens", without text output. Set an explicit budget for the task and the selected model, allowing room for thinking and the final answer. The values in the examples are editable allowances, not upstream defaults or model limits; larger allowances may increase output usage and cost.
messagesobject[]requiredConversation messages. Each message contains role and content.
role supports user and assistant. content may be a string or an array of content blocks.
systemstring | object[]System prompt. Anthropic Messages uses a top-level system field instead of a system role in messages.
streambooleanDefault: falseWhether to return Anthropic SSE events.
temperaturenumberSampling temperature. Accepted values and effects vary by the selected model.
top_pnumberNucleus sampling parameter. Acceptance does not guarantee that it changes generation behavior.
top_kintegerTop-k sampling parameter. Support depends on the selected model.
stop_sequencesstring[]Stop sequences.
Requests with nonempty stop sequences avoid model services known not to support them; if no compatible service is available, the request returns 400 before generation or billing.
toolsobject[]Anthropic tool definitions. Function tools usually include name, description, and input_schema.
tool_choiceobjectTool selection policy, such as { "type": "auto" } or { "type": "tool", "name": "..." }.
thinkingobjectNative Anthropic thinking configuration, subject to the selected model and provider's support. Claude 4.5 uses { "type": "enabled", "budget_tokens": 1024 }; Claude Sonnet/Opus 4.6 also support adaptive thinking. Do not apply a manual budget to every model version. In tool continuations, return the complete ordered assistant content, including thinking, signature, redacted_thinking and tool_use, unchanged. Keep the thinking configuration and required anthropic-beta headers consistent through the tool round trip. For SSE, concatenate signature_delta.signature fragments for the same content block; an empty thinking summary does not mean its signature can be discarded. A provider account access rejection is an upstream failure, not evidence of an invalid signature. Recognized Bedrock account access rejections return HTTP 502 with api_error; ordinary client validation errors retain HTTP 400. Acceptance still requires an enabled upstream account.
metadataobjectRequest metadata.
Prompt Caching
Add cache_control: { "type": "ephemeral" } to a system or message content block. Cache usage may include cache_creation_input_tokens, cache_read_input_tokens, and supported 5-minute or 1-hour creation buckets. A 1-hour TTL also requires the corresponding anthropic-beta header.
Request Examples
Non-Streaming
{
"model": "claude-sonnet-4-6",
"max_tokens": 1024,
"messages": [
{
"role": "user",
"content": "Hello, introduce yourself in one sentence."
}
],
"stream": false
}Streaming
{
"model": "claude-haiku-4-5",
"max_tokens": 1024,
"messages": [
{
"role": "user",
"content": "Reply exactly OK."
}
],
"stream": true
}Response
Non-streaming responses keep the Anthropic Message shape.
idstringResponse ID, such as msg_....
typestringObject type, usually message.
rolestringUsually assistant.
modelstringActual Claude model used.
contentobject[]Native output content blocks, including text, tool_use, and thinking when used.
stop_reasonstringStop reason, such as end_turn, max_tokens, stop_sequence, or tool_use.
usageobjectToken usage, including input_tokens and output_tokens. Cache token fields are included when present.
Success Example
{
"id": "msg_01...",
"type": "message",
"role": "assistant",
"model": "claude-sonnet-4-6",
"content": [
{
"type": "text",
"text": "Hello, I am Claude and can help with writing, coding, and analysis tasks."
}
],
"stop_reason": "end_turn",
"stop_sequence": null,
"usage": {
"input_tokens": 18,
"output_tokens": 24
}
}Streaming Response
When stream: true, the endpoint returns Anthropic SSE events. Common events include:
message_startcontent_block_startcontent_block_deltacontent_block_stoppingmessage_deltamessage_stop
Error Response
See Error Codes and Troubleshooting for the full code reference, protocol differences, and diagnostic steps.
Error responses use the Anthropic-style shape:
{
"type": "error",
"error": {
"type": "authentication_error",
"message": "Invalid credentials or API key has expired."
}
}