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Anthropic · model passport

Anthropic: Claude Sonnet 5.5

claude-sonnet-5-5
  • Cloud only
  • Proprietary licence
  • 1,000,000 context
  • Released 2026-10-09(first seen on LMArena)
12/27axes covered
Overall · LMArena
1,475#31 of 396
Best percentile
100.0AIME (math)
Cohort standing
82.5median 60.6

What the data says

Benchmarked on 12 of 27 tracked axes. Every figure below is the model's own published result on that board.

Strongest axes

  • 100 pct — AIME (math) (100.0%)
  • 99.1 pct — GPQA Diamond (95.6%)
  • 98.6 pct — WebDev Arena (1,774)

Uneven: 42.7 percentile points between its best and worst axis — 100 pct on AIME (math) versus 57.3 pct on SimpleQA Verified.

  • AIME (math)100 pct100.0%Verify →
  • GPQA Diamond99.1 pct95.6%Verify →
  • WebDev Arena98.6 pct1,774Verify →
  • Instruction following96.2 pct1,483Verify →
  • Coding95.4 pct1,530Verify →
  • Hard prompts95.2 pct1,504Verify →
  • Humanity's Last Exam93.5 pct46.1%Verify →
  • Overall92.4 pct1,475Verify →
  • Agent Arena90.9 pct0.130Verify →
  • Factuality Arena89.5 pct1,474Verify →
  • Vision Arena79.3 pct1,266Verify →
  • SimpleQA Verified57.3 pct46.5%Verify →
  • Search ArenaNot benchmarked
  • Document ArenaNot benchmarked
  • FrontierMathNot benchmarked
  • ARC-AGI-2Not benchmarked
  • SimpleBenchNot benchmarked
  • LiveBenchNot benchmarked
  • BFCL v4 (function calling)Not benchmarked
  • SWE-bench Verified (live board)Not benchmarked
  • Terminal-Bench 4.0Not benchmarked
  • MMLU-Pro (Artificial Analysis)Not benchmarked
  • LiveCodeBench (Artificial Analysis)Not benchmarked
  • IFBench (Artificial Analysis)Not benchmarked
  • HHEM Hallucination (Vectara)Not benchmarked
  • SWE-bench VerifiedNot benchmarked
  • Terminal-BenchNot benchmarked

Percentiles are the model's standing within each board's own population. Axes marked "not benchmarked" have no published result for this model — that is an absence of data, not a low score.

How to run it

Use it hosted

API model IDanthropic/claude-sonnet-5.5
Context length1,000,000 tokens
Max output128,000 tokens
Acceptstext, image, file
Input price$2 per 1M tokens
Cached input price$0.10 per 1M tokens
Output price$10 per 1M tokens

API parameters this endpoint supports

Include reasoningMax completion tokensMax tokensReasoningReasoning effortResponse formatStop sequencesStructured outputsTool choiceTool callingVerbosity

Example request

curl https://openrouter.ai/api/v1/chat/completions \
  -H "Authorization: Bearer $OPENROUTER_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{"model":"anthropic/claude-sonnet-5.5","messages":[{"role":"user","content":"Hello"}]}'

View on OpenRouter →

Identifiers, limits and prices are synced from the upstream source shown above. Any field we haven't synced is left out entirely rather than guessed.

  • claude-sonnet-5.5-xhigh stands at 82.5 (raw mean 90.6) — measured on 12 of 27 axes.

    standingtemplateVerify →

  • claude-sonnet-5.5-xhigh stands at 82.5 versus a cohort median of 60.6 across 171 models released within 180 days — above the peer median.

    cohorttemplateVerify →

Every claim is a computed fact from the current board data, phrased by a low-temperature model call and rejected by a validation gate if any number is not in the source row. How the leaderboards work →