in the loop

Claude Sonnet 5.5
#4 of 274 scored.

AnthropicSep 28, 2026Closed

Capabilities Index

Range 161.7–169.1

165.0

Context

Takes text, image, file

1M

Input

Per 1M tokens

$2.00

Output

Per 1M tokens

$10

Benchmarks

How it scores.

  • GPQA Diamond94.1%

    2nd of 186

  • FrontierMath88.8%

    7th of 81

  • SimpleQA Verified46.5%

    34th of 77

  • Mock AIME100%

    1st of 176

Everything else Epoch has for it

  • ProofBench100%
  • FrontierMath-Tier-4-v2-Private80.5%
  • APEX-Agents75.5%
  • Furniture Assembly64.3%
  • FrontierSWE61.9%
  • Mystery Game Puzzles61.5%
  • FrontierCode52.1%

On the index

Around it.

  1. #1Claude Opus 5.5Anthropic · $4.00 in167.3
  2. #2GPT-6 AstraOpenAI · $10 in166.4
  3. #3GPT-6.1 SolOpenAI · $2.00 in166.1
  4. #4Claude Sonnet 5.5Anthropic · $2.00 in165.0
  5. #5Claude Fable 5.1Anthropic · $10 in164.7
  6. #6Claude Opus 5Anthropic · $5.00 in162.8
  7. #7GPT-6 SolOpenAI · $2.00 in162.7

Sources