ResearchLLM Verifications Leaderboard

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

Head to head · tested 27 Oct 2026

Claude Opus 5.5 vs Grok 4.7: accuracy, speed and price

Similar accuracy; Claude Opus 5.5 costs less per question.

AnthropicClaude Opus 5.585.0% score · #1$0.015 per question129 tok/sSpaceXAIGrok 4.780.0% score · #6$0.025 per question77 tok/s

Verdict

Built from the measurements below

  • Accuracy is too close to call: Claude Opus 5.5 scored 85.0% and Grok 4.7 80.0% on the same 80 questions, a gap within what chance alone could produce.
  • Claude Opus 5.5 is 1.7× cheaper per question as billed ($0.015 vs $0.025), reasoning tokens included.
  • Claude Opus 5.5 generates text 1.7× faster: 129 tokens per second against 77.
  • Grok 4.7 starts answering sooner: 1.9 s to the first token, against 2.3 s for Claude Opus 5.5.
  • Claude Opus 5.5 accepts more context: 1M tokens against 500k.

Which should you choose?

Choose Claude Opus 5.5 for the lower cost per correct answer ($0.017 against $0.031), faster streaming, shorter outputs (about 645 tokens per question against 3,952), a 1M-token context window and more hosts to choose from on OpenRouter (5 against 1). Choose Grok 4.7 for a quicker first token.

Accuracy gap +5.0 points (z = 0.83). A winner is called only when z is at least 1.96, the usual 95% threshold. Speed, latency and price need a 10% margin.

Head to head

Same questions, same prompt, same API

MeasureClaude Opus 5.5Grok 4.7Edge
Verification scoreHigher is better85.0%80.0%Too close to call
Cost per questionLower is better$0.015$0.025Claude Opus 5.5
Output speedHigher is better12977Claude Opus 5.5
Time to first tokenLower is better2.3 s1.9 sGrok 4.7
End-to-end response timeLower is better7.6 s8.0 sSimilar
Tokens per questionLower is better6453,952Claude Opus 5.5
Context windowHigher is better1M500kClaude Opus 5.5

Side by side

Bars are scaled to the larger of the two values. The winner on each measure is marked in bold.

Every measure

Claude Opus 5.5 first, Grok 4.7 second

Verification scorehigher is better
Claude Opus 5.585.0%
Grok 4.780.0%
Cost per questionlower is better
Claude Opus 5.5$0.015
Grok 4.7$0.025
Output speedhigher is better
Claude Opus 5.5129
Grok 4.777
Time to first tokenlower is better
Claude Opus 5.52.3 s
Grok 4.71.9 s
End-to-end response timelower is better
Claude Opus 5.57.6 s
Grok 4.78.0 s
Tokens per questionlower is better
Claude Opus 5.5645
Grok 4.73,952
Context windowhigher is better
Claude Opus 5.51M
Grok 4.7500k

Score vs. cost per question

Both models in color, every other model in grey

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-20bMinistral 3 3B 2512Nova Micro 1.0Phi 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-120bLlama 4 Maverick

Specifications and pricing

From OpenRouter's catalogue, plus the leaderboard's test dates

SpecificationClaude Opus 5.5Grok 4.7
CreatorAnthropicSpaceXAI
Released22 Sept 202621 Sept 2026
Weights——
ReasoningYesYes
Inputtext, image, filetext, image, file
Outputtexttext
Context window1M tokens500k tokens
Knowledge cutoff——
List price in / out per 1M$4 / $20$2 / $6
Blended price per 1M (3:1)$8.00$3.00
Cheapest hostAmazon Bedrock · $4 / $20xAI · $2 / $6
Hosts on OpenRouter51
Last tested25 Oct 202627 Oct 2026

Compare any two models →

Claude Opus 5.5 vs Grok 4.7: frequently asked questions

Is Claude Opus 5.5 better than Grok 4.7?
On accuracy they are statistically tied: Claude Opus 5.5 scored 85.0% and Grok 4.7 80.0% on the same 80 questions from open datasets. Similar accuracy; Claude Opus 5.5 costs less per question.
Which is cheaper, Claude Opus 5.5 or Grok 4.7?
Claude Opus 5.5 is cheaper: $0.015 per question as billed, against $0.025. List prices: Claude Opus 5.5 $4 in / $20 out, Grok 4.7 $2 in / $6 out per million tokens.
Which is faster, Claude Opus 5.5 or Grok 4.7?
Claude Opus 5.5 is faster at 129 output tokens per second, against 77. Time to first token: 2.3 s for Claude Opus 5.5, 1.9 s for Grok 4.7.
Which has the larger context window, Claude Opus 5.5 or Grok 4.7?
Claude Opus 5.5, with 1M tokens against 500k.