Claude Opus 5.5: benchmarks, price and rank
Claude Opus 5.5 from Anthropic is 3rd of 123 rated AI models on Spezia's leaderboard, strongest on SWE-Bench Pro and APEX-Agents. It costs $4 in, $20 out per million tokens.
- 3rd of 123 rated models
- Rating 2,045
- First on 1 of 17 benchmarks
- Closed
- Released Sep 22, 2026
- 1 million tokens of context
- Knows the world to June 2026
Where it is strongest
- 2nd of 50 on SWE-Bench Pro
- 5th of 56 on APEX-Agents
- 2nd of 17 on Remote Labor Index
- 3rd of 21 on FrontierSWE
- 3rd of 17 on Terminal-Bench 4.0
Where it falls behind
In the top half on every benchmark it has a result on.
Price: $4 in, $20 out per million tokens.
Its headline results
The benchmarks that count most in the rating, with its place among the models measured the same way, and where each number came from.
- Remote Labor Index21.3%
Real freelance projects that people were paid to do, from design and video to architecture, games and data work. The model gets the same brief and files the freelancer got and has to hand back finished work.
2nd of 17. Independent result from Epoch AI.
- APEX-Agents73.5%
Long tasks written by investment banking analysts, management consultants and corporate lawyers from their own work, done across files and apps in a realistic work setup.
5th of 56. Independent result from Epoch AI.
- Terminal-Bench 4.066.4%
Hard jobs done in a real computer terminal: building and fixing software, setting up systems, and science and engineering problems.
3rd of 17. The maker's own number, from Anthropic, via LLM Stats.
- SWE-Bench Pro89.9%
Long changes to real codebases in several languages, often across many files, including code from private and copyleft projects that models are unlikely to have seen.
2nd of 50. The maker's own number, from Anthropic, via LLM Stats.
- FrontierSWE62.3%
Open-ended technical projects that take hours to tens of hours, from making systems faster to building large programs and applied machine learning research. Each run gets a 20-hour budget.
3rd of 21. Independent result from Epoch AI.
- Vending-Bench 2$9,235
The model runs a simulated vending machine business for a year on its own: finding suppliers, ordering stock, setting prices and paying the daily fees.
12th of 60. Independent result from Epoch AI.
- GDPval-AA1,846
Work products from dozens of occupations, the kind of documents, spreadsheets and plans professionals hand in, made by the model and compared head to head with other models' work.
1st of 5. The maker's own number, from Anthropic, via LLM Stats.
- CursorBench57.8%
Ambiguous coding tasks that span many files, taken from real sessions in the Cursor code editor.
3rd of 20. Independent result from Epoch AI.
- DeepSWE 1.174.2%
Software engineering tasks run in the same simple agent setup for every model.
7th of 27. The maker's own number, from Anthropic, via LLM Stats.
- SimpleBench88.4%
Multiple-choice puzzles about everyday situations, space, time and people, written to trip up models that pattern-match instead of think. Ordinary adults do well on them.
4th of 68. Independent result from Epoch AI.
13 more results in its full profile.
Every result with its source, what it costs per task, what jumped with its release, side by side with any other model, and answers to your questions about when to use it.
Models ranked near it
How the rating works, and every benchmark it uses: the model leaderboard.