ResearchLLM Verifications Leaderboard

Data as of · 78 models, 80 questions · reviewed by Suhas Bhairav · methodology

AnthropicReleased 22 Sept 2026

Claude Opus 5.5 benchmarks, speed and API pricing

Reviewed by Suhas Bhairav · Tested

Compare

Available through OpenRouter on

  • Amazon Bedrock$4 in · $20 out
  • Azure$4 in · $20 out
  • Google$4 in · $20 out
  • Claude Platform on AWS$4 in · $20 out
  • Anthropic$4 in · $20 out
Intelligence85.0% correct#1 of 72
Speed129tok/s#24 of 72
Cost$0.015per question#66 of 72List $4 in · $20 out per 1M
Verbosity645tokens per question#21 of 72

Summary

  • Answers 68 of 80 verification questions correctly (85.0%), placing #1 of 72 models tested on the current suite.
  • Generates 129 output tokens per second, faster than 68% of the models the leaderboard measures.
  • Starts responding after 2.3 s (median time to first token), including thinking time.
  • Costs $0.015 per question as billed, #25 cheapest of 31 models priced over $1 per 1M tokens.

Specifications

Reasoning
Yes
Input
text, image, file
Output
text
Context window
1M tokens
Weights
—
Knowledge cutoff
—
OpenRouter ID
anthropic/claude-opus-5.5
Last tested
25 Oct 2026

Peer group: 34 models with a blended list price over $1 per 1M tokens (3 input : 1 output). Charts below compare Claude Opus 5.5 with all models; cost and speed charts focus on this peer group.

Intelligence

Verification score: the share of 80 questions from open datasets answered correctly. See the benchmark datasets.

Score vs. cost per question

Claude Opus 5.5 circled; dashed line joins models no cheaper model beats

Most attractive quadrant0255075100$0.00001$0.0001$0.001$0.01$0.10Cost per question (USD, log) →Verification score (%) →Qwen3.8 2.4T A95BCommand AReka Flash 3Gemma 4 26B A4BGemma 4 31BQwen3.5 397B A17BHermes 4 405BMuse WonderGrok 4.7o3gpt-oss-20bGranite 4.0 MicroNova Micro 1.0Mercury 2.5Phi 4Granite 4.2 8BHy3GLM 5.3 FlashSolar Pro 4Trinity Large ThinkingMiniMax M3Mistral Large 4Claude Opus 5.5GPT-6.1 SolGemini 4 ArgonGPT-5.4GPT-6 Lunagpt-oss-120b

Score vs. end-to-end response time

Claude Opus 5.5 circled · accurate and quick sits top left

Most attractive quadrant02550751000 s25 s50 s75 s100 sEnd-to-end response time (s) →Verification score (%) →Qwen3.8 2.4T A95BCommand AReka Flash 3Llama 4 ScoutGemma 4 26B A4BLing 3.1 FlashHermes 4 405BMuse WonderGranite 4.0 MicroSolar Pro 4DeepSeek V4 Pro 0813Mistral Large 4Claude Opus 5.5Llama 4 MaverickKimi K3.1 Pro

Score vs. tokens per question

Claude Opus 5.5 circled · output tokens, reasoning included

Most attractive quadrant02550751001001,00010,000Output tokens per question (log) →Verification score (%) →Command AReka Flash 3Llama 4 ScoutQwen3.7 PlusGemma 4 26B A4BGemma 4 31BQwen3.5 397B A17BHermes 4 405BClaude Fable 5.1GPT-6 AstraMuse WonderGrok 4.7o3gpt-oss-20bGranite 4.0 MicroNova Micro 1.0Mercury 2.5Granite 4.2 8BMinistral 3 14B 2512Hy3GLM 5.3 FlashSolar Pro 4Qwen3.6 35B A3BInkling SmallNemotron 3 UltraClaude Opus 5.5Gemini 4 ArgonGPT-5.4GPT-6 SolMiMo-V2.6-Pro

Verification score

All models tested on the current suite

  1. 1Claude Opus 5.585.0
  2. 2Gemini 4 Argon83.8
  3. 3GPT-5.3-Codex82.5
  4. 3Gemini 3.8 Flash82.5
  5. 5Claude Fable 5.181.2
  6. 6Grok 4.780.0
  7. 7Muse Wonder78.8
  8. 7Claude Sonnet 5.578.8
  9. 9Gemini 3.1 Pro Preview77.5
  10. 9Muse Spark Open77.5

62 more models · see the full leaderboard

6 of 78 tested models have no verification score

Cost

Average cost of one question, split into input, reasoning and answer tokens at each model's list price. Reasoning tokens are billed as output.

Cost per question, by token type

Peer group: blended price over $1

  1. 1Inkling$0.0012
  2. 2GPT-6.1 Terra$0.0013
  3. 3GPT-6 Sol$0.0024
  4. 4GPT-6.1 Sol$0.0029
  5. 5Gemini 3.8 Flash$0.0041
  6. 6Muse Spark Open$0.0046
  7. 7Step 5 Preview$0.0047
  8. 8GPT-6.1 Terra Pro$0.005
  9. 9Nemotron 3 Ultra$0.0054
  10. 10Claude Sonnet 5.5$0.0054
  11. 11DeepSeek V4 Pro 0813$0.0056
  12. 12Kimi K2.7 Code$0.0057
  13. 13Gemini 4 Argon$0.0063
  14. 14GPT-5.6 Terra$0.0063
  15. 15Command A$0.007
  16. 16o3$0.0088
  17. 17Hermes 4 405B$0.01
  18. 18GPT-5.3-Codex$0.01
  19. 19Kimi K3.1 Pro$0.01
  20. 20Qwen3.8 Max (0902)$0.011
  21. 21Mistral Large 4$0.011
  22. 22GPT-5.4$0.011
  23. 23GPT-6 Astra$0.013
  24. 24Qwen3.5 397B A17B$0.015
  25. 25Claude Opus 5.5$0.015
  26. 26Qwen3.8 2.4T A95B$0.015
  27. 27Claude Fable 5.1$0.016
  28. 28Gemini 3.1 Pro Preview$0.017
  29. 29Muse Wonder$0.021
  30. 30Mistral Medium 3.5$0.025
  31. 31Grok 4.7$0.027
Input Reasoning Answer

Cost per question, as billed

All models · lower is better

  1. 1Granite 4.0 Micro$0.000051
  2. 2gpt-oss-20b$0.000066
  3. 3Granite 4.2 8B$0.000077
  4. 4Nova Micro 1.0$0.000087
  5. 5Mercury 2.5$0.00011
  6. 6Phi 4$0.00012
  7. 7gpt-oss-120b$0.00013
  8. 8GLM 5.3 Flash$0.00015
  9. 9Ministral 3 3B 2512$0.00019
  10. 10GPT-6 Luna$0.00025
  11. 66Claude Opus 5.5$0.015

61 more models · see the full leaderboard

6 of 78 tested models have no cost per question
  • LFM2.5-2.6B: no verification score (80 of 80 questions failed on the host's side)
  • Ling 3.0 Flash VL: no verification score (not yet run on the current question suite)
  • Qwen3.5-122B-A10B: no verification score (not yet run on the current question suite)
  • Qwen3 Next 80B A3B Thinking: no verification score (not yet run on the current question suite)
  • Nova Premier 1.0: no verification score (not yet run on the current question suite)
  • GPT-5.5 Pro: no verification score (not yet run on the current question suite)

Speed and latency

Median of 3 streamed runs of the same prompt, measured 25 Oct 2026.

Output speed

Peer group (over $1) · higher is better

  1. 1Qwen3.5 397B A17B240
  2. 2Muse Spark Open220
  3. 3Muse Wonder175
  4. 4o3163
  5. 5Mistral Medium 3.5145
  6. 6Gemini 3.8 Flash142
  7. 7Kimi K2.7 Code136
  8. 8Nemotron 3 Ultra136
  9. 9Claude Opus 5.5129
  10. 10Claude Sonnet 5.5126
  11. 11Gemini 3.1 Pro Preview124
  12. 12GPT-6.1 Terra122

19 more models · see the full leaderboard

3 of 34 tested models have no output speed
  • GPT-6.1 Terra Pro: answer arrives in one burst after hidden thinking, so there is no real stream speed
  • Nova Premier 1.0: speed runs failed on the host's side
  • GPT-5.5 Pro: answer arrives in one burst after hidden thinking, so there is no real stream speed

Latency vs. output speed

Claude Opus 5.5 circled · quick to start and fast sits top left

Most attractive quadrant02004006008000.0 s5.0 s10.0 s15.0 s20.0 sTime to first token (s) →Output speed (tok/s) →Nemotron 3.5 Super VLQwen3.5 397B A17BMuse WonderMinistral 3 3B 2512Trinity Large ThinkingGemini 3.5 Flash LiteGemini 3.1 Pro PreviewGemini 3.8 FlashGemini 4 Argon

Results by category

Questions answered correctly in each category

Science28/30
Engineering12/15
Medicine7/11
Economics8/9
Law5/6
Humanities & social science8/9

More from Anthropic

Anthropic#5Claude Fable 5.181.2% verification score70 tok/s2.1 s first token$0.016 / questionAnthropic#7Claude Sonnet 5.578.8% verification score126 tok/s0.7 s first token$0.0054 / questionAnthropic#26Claude Haiku 5.568.8% verification score192 tok/s0.7 s first token$0.00048 / question

All Anthropic models →

Compare Claude Opus 5.5

Head to head with its closest rivals, other Anthropic models and the top models overall.

Hosts and prices

Every host serving this model through OpenRouter, from OpenRouter's catalogue

HostInput / 1MOutput / 1MContextMax outputQuantization
Amazon Bedrock$4$201M128k—
Azure$4$201M128k—
Google$4$201M128k—
Claude Platform on AWS$4$201M128k—
Anthropic$4$201M128k—

Claude Opus 5.5: frequently asked questions

How accurate is Claude Opus 5.5?
Claude Opus 5.5 answered 68 of 80 questions correctly (85.0%) in the 2026-10-27 run, ranking #1 of 78 models.
How fast is Claude Opus 5.5?
Claude Opus 5.5 generated a median of 129 output tokens per second in the 2026-10-27 run, ranking #24 of 78. Median time to first token was 2.3 s.
What is the latency of Claude Opus 5.5?
Claude Opus 5.5 had a median time to first token of 2.3 s in the 2026-10-27 run, ranking #66 of 78 models.
How much does Claude Opus 5.5 cost?
Claude Opus 5.5 cost $0.015 per question on average as billed in the 2026-10-27 run, reasoning tokens included.
What is Claude Opus 5.5 API pricing?
Claude Opus 5.5 is listed at $4 per million input tokens and $20 per million output tokens on OpenRouter.
What is the context window of Claude Opus 5.5?
Claude Opus 5.5 accepts up to 1,000,000 tokens of context, according to OpenRouter's model catalogue.
Who makes Claude Opus 5.5?
Claude Opus 5.5 is made by Anthropic. The LLM Verifications Leaderboard tested it through OpenRouter using the model ID anthropic/claude-opus-5.5.
Where can I use Claude Opus 5.5 via API?
Through OpenRouter, Claude Opus 5.5 is served by 1 host: Claude Platform on AWS.