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Anthropic

Claude Opus 5.5

  • Released
  • Closed weights
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Intelligence Index

Max setting

57.6#1 of 83measured models
Measured · Artificial Analysis v4.3.2
API price from
$4.00 in / $20.00 out / 1M tokAnthropic · direct API
Context window
1M tok

Performance profile

CodingRank #1 of 94
66.9%
SciCode
Cost efficiencyRank #65 of 67
9.6pts / $
Intelligence ÷ eval cost

Capabilities

Context window

Modalities

Reasoning modes

Avg reasoning tokens / task — Artificial Analysis Intelligence Index v4.3.2: weighted average reasoning tokens per benchmark task, not a token limit. Source (opens in a new tab)

Integration

Reasoning trade-offs

Source (opens in a new tab)
Intelligence Index v4.3.2
Claude Opus 5.5
Cost per task (USD) · log scale
Claude Opus 5.5Max
Intelligence Index
57.6
Cost / task
$5.98
Evaluation time
13.1m

Pricing & access

API route
AnthropicAPI
Tier & context

USD per 1M tokens

Input
$4.00
Output
$20.00
Cached input
$0.20

Available plans · USD

All plans for Claude (opens in a new tab)

Personal

Free
$0/moNot included
Pro
$20/mo
Max 5x
$100/mo
Max 20x
$200/mo
Organizations4 plans
Team Standard
$25/seat/mo
Team Premium
$125/seat/mo
Enterprise
$20/seat/moAnnual · + usage
Education
CustomAccess not verified

Benchmarks

Full leaderboardSource (opens in a new tab)

Humanity’s Last Exam

Frontier reasoning

Claude Opus 5.5 · Max#1 of 126

  1. 1Claude Opus 5.5Max61.4%
  2. 2Claude Fable 5.1Max59.1%
  3. 3Gemini 4 ArgonHigh57.1%
  4. 4Claude Sonnet 5.5Max55.0%
  5. 5GPT-6 AstraMax54.7%
  6. 6Muse Wonder FullMax53.6%
  7. 7GPT-6.1 SolMax52.9%
  8. 8Muse WonderMax50.1%
  9. 9MiMo-V2.6-ProReasoning49.4%
  10. 10Muse Spark 1.3Max48.7%

Peers use their best measured result on this benchmark.

Alternatives

Each model at its highest-scoring measured setting · Intelligence Index v4.3.2 and its evaluation cost per task.