Skip to content
aiqbench

Anthropic · model passport

Anthropic: Claude Opus 5.5

claude-opus-5-5
  • Cloud only
  • Proprietary licence
  • 1,000,000 context
  • Released 2026-10-09(first seen on LMArena)
13/27axes covered
Overall · LMArena
1,508#3 of 396
Best percentile
100.0WebDev Arena
Cohort standing
87.2median 60.6

What the data says

Benchmarked on 13 of 27 tracked axes. Every figure below is the model's own published result on that board.

Strongest axes

  • 100 pct — WebDev Arena (1,811)
  • 100 pct — Agent Arena (0.189)
  • 100 pct — AIME (math) (100.0%)

Uneven: 23.8 percentile points between its best and worst axis — 100 pct on WebDev Arena versus 76.2 pct on Search Arena.

  • WebDev Arena100 pct1,811Verify →
  • Agent Arena100 pct0.189Verify →
  • AIME (math)100 pct100.0%Verify →
  • Instruction following99.7 pct1,518Verify →
  • Hard prompts99.7 pct1,533Verify →
  • Overall99.5 pct1,508Verify →
  • Factuality Arena99.4 pct1,509Verify →
  • Coding98.7 pct1,548Verify →
  • ARC-AGI-297.8 pct93.3%Verify →
  • SimpleQA Verified95.1 pct72.2%Verify →
  • Vision Arena94.7 pct1,293Verify →
  • GPQA Diamond83.7 pct90.6%Verify →
  • Search Arena76.2 pct1,211Verify →
  • Document ArenaNot benchmarked
  • FrontierMathNot benchmarked
  • Humanity's Last ExamNot 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-opus-5.5
Context length1,000,000 tokens
Max output128,000 tokens
Acceptstext, image, file
Input price$4 per 1M tokens
Cached input price$0.20 per 1M tokens
Output price$20 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-opus-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 Opus 5.5 (High) stands at 87.2 (raw mean 95.7) — measured on 13 of 27 axes.

    standingtemplateVerify →

  • Claude Opus 5.5 (High) stands at 87.2 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 →