The Claude Opus API gives you programmatic access to every live tier of Anthropic's flagship Opus line — Claude Opus 5.5, Claude Opus 5, and the 4.8, 4.7, 4.6, and 4.5 predecessors — through one Muapi API key, one request shape, and both standard async and live-streaming endpoints.Every tier accepts the same prompt / image_url / system_prompt request body, so switching between generations is a one-line model-name change. Claude Opus 5.5 is billed at Anthropic's own published rate ($4.00/M input, $20.00/M output tokens) with no Muapi markup.
Anthropic's newest Opus model — top-tier coding, long-context reasoning, and agentic workflows at a lower price than Opus 5, billed at official Anthropic rates.
Anthropic's current-generation flagship model for complex coding, long-context reasoning, and agentic workflows.
Prior-generation Opus flagship — complex coding, long-context reasoning, and agentic workflows.
Prior-generation Opus flagship, still fully supported for existing integrations.
Prior-generation Opus flagship, still fully supported for existing integrations.
The earliest live Opus tier on Muapi, kept available for existing integrations.
Claude Opus is Anthropic's flagship model line, built for the most demanding engineering and knowledge-work tasks — large refactors, architecture decisions, multi-file agentic coding, and long-context reasoning across research papers, codebases, and documents. Submit a prompt — optionally alongside a reference image and a system prompt to steer tone and behavior — and get back a text response.
Muapi exposes every live Opus tier — Claude Opus 5.5, Claude Opus 5, Claude Opus 4.8, Claude Opus 4.7, Claude Opus 4.6, and Claude Opus 4.5 — through the same request shape, so upgrading or comparing generations is a one-line model-name change. Each tier is available as a standard asynchronous submit-and-poll endpoint or a Server-Sent Events streaming endpoint for live chat UIs.
Call /claude-opus-5-5 for the newest release or any earlier tier down to /claude-opus-4-5 — same request shape, same Muapi API key.
Claude Opus 5.5 is billed at Anthropic's own published rate ($4.00/M input, $20.00/M output tokens) with no Muapi markup.
Tackle large refactors, architecture decisions, and multi-step autonomous agent tasks that need the highest reliability and reasoning depth.
Pass an optional image_url alongside your prompt so Claude Opus can reason about charts, diagrams, screenshots, and stack traces, not just text.
Set a system_prompt to steer tone, persona, or output format across a request.
Use the standard submit-and-poll endpoint for batch jobs and workflows, or the SSE streaming endpoint to render tokens live in a chat interface.
| Endpoint | Input | Output | Price | Best For |
|---|---|---|---|---|
| claude-opus-5-5 | Prompt + optional image_url, system_prompt | Complete text response (poll for result) | $4.00/M in · $20.00/M out | The newest Opus tier, at official Anthropic pricing |
| claude-opus-5 | Prompt + optional image_url, system_prompt | Complete text response (poll for result) | $3.00/M in · $15.00/M out | Current-generation flagship reasoning and coding |
| claude-opus-4-8 | Prompt + optional image_url, system_prompt | Complete text response (poll for result) | $3.00/M in · $15.00/M out | Prior-generation flagship, existing integrations |
| claude-opus-4-7 | Prompt + optional image_url, system_prompt | Complete text response (poll for result) | $3.00/M in · $15.00/M out | Prior-generation flagship, existing integrations |
| claude-opus-4-6 | Prompt + optional image_url, system_prompt | Complete text response (poll for result) | $3.00/M in · $15.00/M out | Prior-generation flagship, existing integrations |
| claude-opus-4-5 | Prompt + optional image_url, system_prompt | Complete text response (poll for result) | $3.00/M in · $15.00/M out | Earliest live Opus tier, existing integrations |
Minimum $0.0006 per call across every Opus tier. Actual cost is deducted after each call based on token counts returned by the model. Every tier also exposes a /stream endpoint at the same price.
Submit a JSON request with your Muapi API key, save the request ID, and poll the shared result endpoint — or call the /stream variant for a live SSE token feed. The request shape is identical across every Opus tier.
curl -X POST https://api.muapi.ai/api/v1/claude-opus-5-5 \
-H "x-api-key: YOUR_API_KEY" \
-H "Content-Type: application/json" \
-d '{"prompt":"Review this pull request diff for correctness and suggest a safer approach.","system_prompt":"You are a precise senior staff engineer.","image_url":"https://example.com/diff-screenshot.png"}'
# Response: {"request_id":"REQUEST_ID"}Call claude-opus-5-5 with a prompt, and optionally a system_prompt and image_url.
curl https://api.muapi.ai/api/v1/predictions/REQUEST_ID/result \ -H "x-api-key: YOUR_API_KEY" # Poll until status is completed, then read the generated text from outputs.
Poll until the task is completed, then read the generated text from outputs.
curl -X POST https://api.muapi.ai/api/v1/claude-opus-5-5/stream \
-H "x-api-key: YOUR_API_KEY" \
-H "Content-Type: application/json" \
-d '{"prompt":"Plan a multi-file refactor for this module and list the follow-up questions."}'
# Response: a stream of SSE chunks, one per line:
# data: {"choices":[{"delta":{"content":"Here"}}]}
# data: {"choices":[{"delta":{"content":" is"}}]}
# data: [DONE]Call claude-opus-5-5/stream with the same fields to receive SSE chunks as the model generates them, ending in a [DONE] marker.
curl -X POST https://api.muapi.ai/api/v1/claude-opus-5 \
-H "x-api-key: YOUR_API_KEY" \
-H "Content-Type: application/json" \
-d '{"prompt":"Debug this stack trace and propose a fix.","image_url":"https://example.com/stack-trace.png"}'
# Response: {"request_id":"REQUEST_ID"}Same request shape on the current-generation flagship tier.
curl https://api.muapi.ai/api/v1/predictions/REQUEST_ID/result \ -H "x-api-key: YOUR_API_KEY" # Poll until status is completed, then read the generated text from outputs.
Same shared result endpoint, regardless of which model version submitted the task.
curl -X POST https://api.muapi.ai/api/v1/claude-opus-4-8 \
-H "x-api-key: YOUR_API_KEY" \
-H "Content-Type: application/json" \
-d '{"prompt":"Review this code and suggest improvements for performance and readability."}'
# Response: {"request_id":"REQUEST_ID"}Same request shape on the prior-generation flagship tier.
curl https://api.muapi.ai/api/v1/predictions/REQUEST_ID/result \ -H "x-api-key: YOUR_API_KEY" # Poll until status is completed, then read the generated text from outputs.
Same shared result endpoint.
curl -X POST https://api.muapi.ai/api/v1/claude-opus-4-7 \
-H "x-api-key: YOUR_API_KEY" \
-H "Content-Type: application/json" \
-d '{"prompt":"Summarize the key risks in this architecture proposal."}'
# Response: {"request_id":"REQUEST_ID"}Same request shape on an earlier flagship tier.
curl https://api.muapi.ai/api/v1/predictions/REQUEST_ID/result \ -H "x-api-key: YOUR_API_KEY" # Poll until status is completed, then read the generated text from outputs.
Same shared result endpoint.
curl -X POST https://api.muapi.ai/api/v1/claude-opus-4-6 \
-H "x-api-key: YOUR_API_KEY" \
-H "Content-Type: application/json" \
-d '{"prompt":"Draft a technical design doc outline for this feature."}'
# Response: {"request_id":"REQUEST_ID"}Same request shape on an earlier flagship tier.
curl https://api.muapi.ai/api/v1/predictions/REQUEST_ID/result \ -H "x-api-key: YOUR_API_KEY" # Poll until status is completed, then read the generated text from outputs.
Same shared result endpoint.
curl -X POST https://api.muapi.ai/api/v1/claude-opus-4-5 \
-H "x-api-key: YOUR_API_KEY" \
-H "Content-Type: application/json" \
-d '{"prompt":"Analyze this dataset summary and flag anomalies."}'
# Response: {"request_id":"REQUEST_ID"}Same request shape on the earliest live Opus tier.
curl https://api.muapi.ai/api/v1/predictions/REQUEST_ID/result \ -H "x-api-key: YOUR_API_KEY" # Poll until status is completed, then read the generated text from outputs.
Same shared result endpoint, regardless of which model version submitted the task.
Claude Opus is Anthropic's flagship line of models, built for the most demanding coding, reasoning, and agentic tasks. Muapi exposes every live tier — 5.5, 5, 4.8, 4.7, 4.6, and 4.5 — as standard REST APIs, so any application can call them with an API key instead of an Anthropic account.
Use Claude Opus 5.5 for the newest model at official Anthropic pricing, or Claude Opus 5 for the current-generation flagship. The 4.8, 4.7, 4.6, and 4.5 tiers remain live for existing integrations that don't need to move to a newer release.
Claude Opus 5.5 is $4.00 per million input tokens and $20.00 per million output tokens — Anthropic's own official rate, with no Muapi markup. Claude Opus 5, 4.8, 4.7, 4.6, and 4.5 are each $3.00 per million input tokens and $15.00 per million output tokens. Every tier has a $0.0006 minimum per call.
Yes, on every tier. Pass an image_url alongside your prompt and the model will reason about both the text and the image together — including charts, diagrams, screenshots, and stack traces.
POST /api/v1/claude-opus-{tier} is asynchronous: it returns a request_id you poll via /api/v1/predictions/{id}/result. Adding /stream to any tier's path returns Server-Sent Events chunks in real time, ending in a data: [DONE] line, for live chat interfaces.
No. Muapi exposes every Claude Opus tier as standard REST endpoints. Create a Muapi API key, submit JSON, and either poll the returned request ID or read the SSE stream.
No — Claude Opus 5.5 is priced at Anthropic's official rate ($4.00/M in, $20.00/M out), which is higher than the discounted $3.00/M in, $15.00/M out Muapi charges for Claude Opus 5 and the 4.x tiers. Choose based on capability needs, not just price.
Create one Muapi API key and connect every live Claude Opus tier to your product through a plain REST call or a live SSE stream.