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Anthropic · model passport

Anthropic: Claude Opus 5

claude-opus-5
  • Cloud only
  • Proprietary licence
  • 1,000,000 context
  • Released 2026-09-13(first seen on LMArena)
15/27axes covered
Overall · LMArena
1,490#12 of 396
Best percentile
98.9SimpleBench
Cohort standing
85.6median 60.3

What the data says

Benchmarked on 15 of 27 tracked axes. Every figure below is the model's own published result on that board.

Strongest axes

  • 98.9 pct — SimpleBench (80.6%)
  • 98.5 pct — Instruction following (1,496)
  • 97.5 pct — Hard prompts (1,514)

Uneven: 20.3 percentile points between its best and worst axis — 98.9 pct on SimpleBench versus 78.6 pct on Search Arena.

  • SimpleBench98.9 pct80.6%Verify →
  • Instruction following98.5 pct1,496Verify →
  • Hard prompts97.5 pct1,514Verify →
  • Overall97.2 pct1,490Verify →
  • Factuality Arena97.1 pct1,489Verify →
  • WebDev Arena96.4 pct1,690Verify →
  • Coding96.2 pct1,533Verify →
  • ARC-AGI-295.5 pct90.4%Verify →
  • GPQA Diamond94.1 pct93.9%Verify →
  • Vision Arena92 pct1,287Verify →
  • AIME (math)91.5 pct98.9%Verify →
  • Document Arena89.5 pct1,490Verify →
  • Agent Arena87.3 pct0.087Verify →
  • SimpleQA Verified80.5 pct59.9%Verify →
  • Search Arena78.6 pct1,214Verify →
  • FrontierMathNot benchmarked
  • Humanity's Last ExamNot 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
Context length1,000,000 tokens
Max output128,000 tokens
Acceptstext, image, file
Input price$5 per 1M tokens
Cached input price$0.50 per 1M tokens
Output price$25 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","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 (Max) stands at 85.6 (raw mean 92.7) — measured on 15 of 27 axes.

    standingtemplateVerify →

  • Claude Opus 5 (Max) stands at 85.6 versus a cohort median of 60.3 across 176 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 →