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Claude Opus 5.5

by Anthropic

Claude Opus 5.5 is Anthropic's flagship model for demanding reasoning, coding, and long-horizon agentic work, succeeding Claude Opus 5. It is particularly strong at multi-step chan

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Models

Claude Opus 5.5

Added 24 Sept 2026

#anthropic

Overview

Claude Opus 5.5 is Anthropic's flagship model for demanding reasoning, coding, and long-horizon agentic work, succeeding Claude Opus 5. It is particularly strong at multi-step changes in large codebases, code...

Best for

Best for
Complex repository changes

How to use / API access

Call via OpenRouter with model id `anthropic/claude-opus-5.5`.

  • openrouter · anthropic/claude-opus-5.5 Docs

OpenRouter id: anthropic/claude-opus-5.5

Benchmarks

  • Intelligence Index (artificial-analysis): 57.6 index
  • Design Arena mobileapps (other): 1326 elo · #2
  • Design Arena 3d (other): 1479 elo · #1
  • Design Arena codecategories (other): 1391 elo · #1
  • Design Arena dataviz (other): 1399 elo · #1

Notes

Claude Opus 5.5 is listed in the EDNA Models directory from the OpenRouter catalogue.

Pros

  • Cross-file refactors with a written plan
  • text, image, file input; text output on the listed OpenRouter route

Cons

  • Routine label extraction where a smaller model meets the same checks
  • Unsupervised repository writes without tests
  • Base text-token rates exclude other modalities, tools, caching, retries and any hosting-specific charges. Check actual usage before comparing cost per successful task.
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USAGE / OPENROUTER

How much Claude Opus 5.5 is used

Tokens processed through OpenRouter each day. It shows what developers actually run, not every company's private traffic.

Tokens, last 7 days
6.2T ▲23.1%
Requests, last 7 days
49.7M
Tool calls, last 7 days
32.4M
Intelligence score
57.6
People's vote
1516
Average cost per request
$10.67
Price per million tokens
$4 in · $20 out
01T2T22 Sept: 27.6B tokens, 358K requests23 Sept: 194B tokens, 2.5M requests24 Sept: 225B tokens, 2.7M requests25 Sept: 242B tokens, 3M requests26 Sept: 188B tokens, 2.6M requests27 Sept: 205B tokens, 2.4M requests28 Sept: 322B tokens, 3.5M requests29 Sept: 313B tokens, 3.6M requests30 Sept: 440B tokens, 4.6M requests1 Oct: 360B tokens, 3.8M requests2 Oct: 345B tokens, 3.9M requests3 Oct: 333B tokens, 3M requests4 Oct: 354B tokens, 3.3M requests5 Oct: 459B tokens, 4.3M requests6 Oct: 642B tokens, 5.7M requests7 Oct: 885B tokens, 7.7M requests8 Oct: 819B tokens, 8.3M requests9 Oct: 830B tokens, 7.1M requests10 Oct: 700B tokens, 6M requests11 Oct: 690B tokens, 5M requests12 Oct: 789B tokens, 6.1M requests13 Oct: 932B tokens, 7.3M requests14 Oct: 888B tokens, 7.7M requests15 Oct: 1T tokens, 7.9M requests16 Oct: 934B tokens, 7.5M requests17 Oct: 800B tokens, 7.3M requests18 Oct: 822B tokens, 5.9M requests22 Sept6 Oct18 OctSee where it ranks on the leaderboard →

MODEL FIELD GUIDE / SOURCE EVIDENCE

What you can do with Claude Opus 5.5.

Specifications reviewed; no EDNA task evaluation has been run. Sources checked 2026-10-20. Hosting routes and app features can differ.

DeveloperAnthropic
Exact model identifieranthropic/claude-opus-5.5
Inputtext, image, file
Outputtext
Tool calling
Listed support
Structured output
Listed support
Reasoning controls
Listed support
Availability
available
Price basis
token
Licence verification
Check the developer licence; the model name is insufficient

Base text-token rates exclude other modalities, tools, caching, retries and any hosting-specific charges. Check actual usage before comparing cost per successful task.

Consider it for

  • Cross-file refactors with a written plan
  • Reviewing a change against explicit acceptance criteria

Watch for

  • Routine label extraction where a smaller model meets the same checks
  • Unsupervised repository writes without tests

PRACTICAL EXERCISE / NOT RUN BY ENTERPRISE DNA

Try the model on a small, checkable task.

Given a billing service where discounts are applied after tax, propose the smallest change to apply discounts before tax. Return a migration risk list and tests for zero, full and partial discounts.

Check the result: The plan names calculation order, rounding and backward compatibility; tests cover all three discounts.

Compare another approach

anthropic claude sonnet 5 5 ↗openai gpt 6 1 sol ↗
Inspect the sources and their scope
provider source ↗

Developer documentation for model family or task. OpenRouter route-specific properties remain catalogue claims; EDNA has not executed a task evaluation.

Checked 2026-10-19
catalogue source ↗

anthropic/claude-opus-5.5: listed route capabilities, availability and prices; provider endpoints can differ.

Checked 2026-10-20
How to evaluate a model for your work →

FROM SPECIFICATIONS TO YOUR WORK

Is this the right model for your job?

Start with a realistic sample. These workflows match the model’s listed capabilities, not a verified result on your task.

Write a clear business documentWorkflow & starter prompt ↗Analyse a spreadsheetWorkflow & starter prompt ↗Research a companyWorkflow & starter prompt ↗Extract document dataWorkflow & starter prompt ↗Run a reliable agentWorkflow & starter prompt ↗

Check the source

Price date: 2026-10-20. Prices are USD API token rates. Your app subscription, uploads, browsing and tools are separate.

Model source & availability ↗

Understand the evidence

Listed capabilities and third-party benchmark scores do not establish Enterprise DNA task-test results. Validate accuracy and total cost on your own sample.

Intelligence Index: 57.6 (2026-10-18) ↗
Compare this model with alternatives →