Claude Opus 5.5

What Claude Opus 5.5 is

Claude Opus 5.5 is a commercial cloud model positioned for complex agentic coding and knowledge work. It accepts text and image inputs and produces text. It is not a downloadable local model, and it is distinct from Claude products that provide tools, memory or a complete user interface around a model.

Agentic work means the model participates in a sequence of steps, often requesting tools and using their results. The application determines which tools exist and what they may do. Model capability does not remove the need to inspect a code change, verify an answer or handle an approval.

How it fits into a workflow

An illustrative trial is a bounded code change with an explicit acceptance test and a reviewed diff. The coding application supplies repository access and execution tools; Opus contributes planning and responses. Compare the final behavior with the brief, including any changes outside the requested scope, rather than using the length of its explanation as a success measure.

Examples described as illustrative or proposed trials are editorial suggestions. Documented real builds, when available, are linked separately below.

Requirements, cost and limitations

Check current model access, API pricing and migration guidance. Thinking-off is no longer supported for this model, so an integration designed around an older model may need changes. Documented context and output limits are ceilings, not promises that a full-length input will always be understood correctly.

When to choose it and what to compare

Evaluate Opus when task complexity justifies testing a larger cloud model. Sonnet and Haiku serve different starting points in the family, and a lower token price does not alone establish lower task cost. Use the same success criteria and include corrections and tool usage in the comparison.

Access, running cost and practical requirements

Frontier hosted candidate — editorial selection. How we use this label.

Claude API, Amazon Bedrock, Google-managed Claude on Google Cloud, Microsoft Foundry and Anthropic-managed cloud offerings are listed. Claude app model availability depends on plan/admin controls; app and API usage have distinct allowances.

Developer API prices

Billing route

Claude API base

Units

USD per one million tokens

Input

$4

Cached input

$0.2

Output

$20

5-minute cache write

$5

1-hour cache write

$8

Batch input/output discounted 50%; partner-platform prices and optional tool charges need separate checking.

API prices are not a chat subscription price. A token is a unit of processed text; images and other inputs have their own token accounting. Repeated history, reasoning output and tools can change the final bill. A subscription may offer separately claimed credits, subject to its terms.

What the configuration changes

Provider recommends it as the general starting point for demanding work before Fable.

Adaptive thinking is always on; default API effort medium.

Migration is not just a model-name swap: disabled thinking and forced tool choice are rejected; older computer-use tool format may be unsupported.

Safeguards/fallbacks affect both real use and some published benchmark results.

Benchmark evidence and what it means

These are selected source-reported observations, not a league table. Task, version, tool access, reasoning budget and test harness all affect a result. A historical score does not establish current leadership or accuracy on your own work.

Sources and evidence

Product facts are based on the following published sources, checked 2026-10-27. Workflow suggestions and comparisons are editorial interpretation; PrisAIm has not independently benchmarked this product.