Model detail
claude-opus-4-6
Opus 4.6 is Anthropic’s strongest model for coding and long-running professional tasks. It is built for agents that operate across entire workflows rather than single prompts, making it especially effective for large codebases, complex refactors, and multi-step debugging that unfolds over time. The model shows deeper contextual understanding, stronger problem decomposition, and greater reliability on hard engineering tasks than prior generations. Beyond coding, Opus 4.6 excels at sustained knowledge work. It produces near-production-ready documents, plans, and analyses in a single pass, and maintains coherence across very long outputs and extended sessions. This makes it a strong default for tasks that require persistence, judgment, and follow-through, such as technical design, migration planning, and end-to-end project execution. For users upgrading from earlier Opus versions, see our [official migration guide here](https://openrouter.ai/docs/guides/guides/model-migrations/claude-4-6-opus)
Model specs
- Context length
- 1M
- Max output
- 128K
- I/O modalities
- Text / Image
- Released
- 2026-02
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API endpoints
One MixRoute gateway, OpenAI-compatible
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Anthropic Messages
/v1/messagesPOST -
OpenAI-compatible
/v1/chat/completionsPOST
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Pricing
Flat rate, unit: /1M Tokens
Input
$5.0000 /1M Tokens
Completion
$25.0000 /1M Tokens
Cache read
$0.5000 /1M Tokens
Cache creation
$6.2500 /1M Tokens
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Selection summary
Quickly judge whether it fits your workload
What is this model good for?
Coding and long-running professional tasks end-to-end
Use Opus 4.6 for large codebases, complex refactors, and multi-step debugging. It excels at sustained knowledge work, producing near-production-ready documents, plans, and analyses in a single pass.
What should you check before using it?
Test on hard engineering and knowledge work tasks
Opus 4.6 shows deeper contextual understanding and stronger problem decomposition. Test your most demanding engineering tasks and verify the quality of sustained knowledge work outputs.
Why use it through MixRoute?
Use the compatible endpoint with stable model ID
Use the confirmed compatible endpoint with model ID claude-opus-4-6 through MixRoute.
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Token cost estimator
Live estimate from this page's pricing, not an actual bill
Share of the same prefix read repeatedly, up to 100%
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FAQ
Opus 4.6 is Anthropic’s strongest model for coding and long-running professional tasks. It is built for agents that operate across entire workflows, making it effective for large codebases, complex refactors, and multi-step debugging.
One endpoint, a testable decision
Test this model and alternate routes with the same request format
Start from a real workload, then let quality, total cost, and failure conditions decide whether to send production traffic.