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Claude Opus 5.5

by Anthropic · Released Sep 2026

Multimodal1M Context
91.9
avg score
Rank #6
Compare
Top 2% of all models
Context
1.0M tokens (~500 books)
Input $/1M
$4.00
Output $/1M
$20.00
Type
multimodal
License
Proprietary
Benchmarks
27 tested
Data as of
About

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...

Tested on 27 benchmarks · BenchGecko score 91.9. Top scores: OTIS Mock AIME 2024-2025 (100.0%), Proofbench (100.0%), ARC-AGI (98.5%).

Looking for similar performance at lower cost?
Step 3.5 Flash scores 89.5 (97% as good) at $0.10/1M input · 98% cheaper
Capabilities
coding
64.8
#33 globally
reasoning
95.9
#3 globally
math
95.4
#7 globally
knowledge
57.1
#83 globally
agentic
73.5
#5 globally
speed
65.5
#1 globally
general
73.6
#5 globally
Benchmark Scores
Compare All
Tested on 27 benchmarks · Ranked across 7 categories
Score Distribution (all 319 models)
0255075100
▲ You are here
codingCompare coding →
Mirrorcode
77.4·
Frontierswe
62.3·
Frontiercode
54.6·
reasoningCompare reasoning →
ARC-AGI

Abstraction and Reasoning Corpus. Tests fluid intelligence through novel visual pattern recognition puzzles. Core measure of general intelligence.

98.5·
ARC-AGI-2

ARC-AGI 2, harder sequel to ARC. More complex abstract reasoning patterns that test generalization ability beyond training data.

93.3·
mathCompare math →
OTIS Mock AIME 2024-2025

Mock AIME (American Invitational Mathematics Exam) problems from OTIS. Tests mathematical competition performance.

100.0·
FrontierMath-Tier-4-v2-Private
95.0·
FrontierMath-Tiers-1-3-v2-Private
91.2·
Quick compare:OpenAI logovs GPT-6.1 Solstepfun logovs Step 3.5 FlashOpenAI logovs GPT-5 Chat
Excellent (85+) Good (70-85) Average (50-70) Below (<50)
Model Family · Anthropic Claude Opus
Jan 2024
28.1
n/an/actx13 benchmarks
May 2025
49.5+21.4
$15.00/M in200Kctx23 benchmarks
Aug 2025
42.3-7.2
$15.00/M in200Kctx23 benchmarks
Aug 2025
$7.50/M in(-7.50)200Kctx
Nov 2025
58.3+16.0
$5.00/M in(-2.50)200Kctx42 benchmarks
Nov 2025
$2.50/M in(-2.50)200Kctx
Feb 2026
65.3+7.0
$5.00/M in(+2.50)1.0Mctx(+800K)40 benchmarks
Feb 2026
$2.50/M in(-2.50)1.0Mctx
Apr 2026
83.3+18.0
$30.00/M in(+27.50)1.0Mctx12 benchmarks
Apr 2026
64.3-19.0
$5.00/M in(-25)1.0Mctx30 benchmarks
Apr 2026
$2.50/M in(-2.50)1.0Mctx
May 2026
$30.00/M in(+27.50)1.0Mctx3 benchmarks
May 2026
70.7+6.4
$5.00/M in(-25)1.0Mctx29 benchmarks
May 2026
$2.50/M in(-2.50)1.0Mctx
May 2026
$10.00/M in(+7.50)1.0Mctx3 benchmarks
Jul 2026
86.0+15.3
$5.00/M in(-5)1.0Mctx23 benchmarks
Jul 2026
$2.50/M in(-2.50)1.0Mctx
Jul 2026
$10.00/M in(+7.50)1.0Mctx
Sep 2026
91.9+5.9
$4.00/M in(-6)1.0Mctx27 benchmarks
Sep 2026
$2.00/M in(-2)1.0Mctx
See the full Claude Opus family →
Recently Happened
Claude Opus 5.5 added
Sep 23, 2026
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Links
Info
AnthropicPricing explorerDevelopers · API
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BenchGecko API
claude-opus-5-5
Specifications
  • Typemultimodal
  • Context1.0M tokens (~500 books)
  • ReleasedSep 2026
  • LicenseProprietary
  • StatusActive
  • Cost / Message~$0.028
Available On
Anthropic logoAnthropic$4.00
Categories
codingreasoningmathknowledgeagenticspeedgeneral
Learn More
context-windowtransformertokens
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Claude Opus 5.5 is a proprietary multimodal AI model by Anthropic, released in September 2026. It has an average benchmark score of 91.9. Context window: 1M tokens.

Related Models

GPT-6.1 Sol · OpenAIStep 3.5 Flash · stepfunGPT-5 Chat · OpenAIDeepSeek V3.2 Speciale · DeepSeekGemini 4 Argon · Google DeepMind

Benchmarks

OTIS Mock AIME 2024-2025ProofbenchARC-AGIDtbenchFrontierMath-Tier-4-v2-Private

Related Pages

Anthropic · ProviderAnthropic · EconomyAll ModelsCompare ModelsPricingDevelopers · APIContext Window · Glossary

Key facts · as of 2026-10-16

  • Claude Opus 5.5 by Anthropic. BenchGecko score 91.9, rank 6 of 319 scored models (normalized average of public benchmark scores).
  • List price $4.00 input · $20.00 output per 1M tokens (as of 2026-10-16).
  • Sold by 11 providers (as of 2026-10-16): Amazon Bedrock $4.00 in / $20.00 out · Anthropic $4.00 in / $20.00 out · Azure $4.00 in / $20.00 out · Claude Platform on AWS $4.00 in / $20.00 out · Google $4.00 in / $20.00 out · and 6 more. Every provider
  • Gecko Tests · Gecko Score 63 (rank 2): Who Are You B (Knows who made it) · Censorship Index A (Answers almost everything) · Knowledge Horizon A (Knows news up to May 2026) · Tokenizer Tax E (73% more tokens outside English).

How to cite · data as of 2026-10-16

Claude Opus 5.5 · benchmarks, pricing and providers. BenchGecko, data as of 2026-10-16. https://benchgecko.ai/model/claude-opus-5-5

Credit "Source: BenchGecko" with a link. Prices per provider and Gecko Tests are BenchGecko data (CC BY 4.0); benchmark scores keep their original source, listed in the JSON. JSON · llms.txt · MCP