ResearchLLM Verifications Leaderboard

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

Head to head · tested 27 Oct 2026

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

Similar accuracy; Claude Sonnet 5.5 costs less per question.

AnthropicClaude Sonnet 5.578.8% score · #7$0.0054 per question126 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 Sonnet 5.5 scored 78.8% and Grok 4.7 80.0% on the same 80 questions, a gap within what chance alone could produce.
  • Claude Sonnet 5.5 is 4.6× cheaper per question as billed ($0.0054 vs $0.025), reasoning tokens included.
  • Claude Sonnet 5.5 generates text 1.6× faster: 126 tokens per second against 77.
  • Claude Sonnet 5.5 starts answering sooner: 0.7 s to the first token, against 1.9 s for Grok 4.7.
  • Claude Sonnet 5.5 accepts more context: 1M tokens against 500k.

Which should you choose?

Choose Claude Sonnet 5.5 for the lower cost per correct answer ($0.0069 against $0.031), faster streaming, a quicker first token, shorter outputs (about 456 tokens per question against 3,952), a 1M-token context window and more hosts to choose from on OpenRouter (5 against 1).

Accuracy gap -1.3 points (z = -0.20). 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 Sonnet 5.5Grok 4.7Edge
Verification scoreHigher is better78.8%80.0%Too close to call
Cost per questionLower is better$0.0054$0.025Claude Sonnet 5.5
Output speedHigher is better12677Claude Sonnet 5.5
Time to first tokenLower is better0.7 s1.9 sClaude Sonnet 5.5
End-to-end response timeLower is better6.2 s8.0 sClaude Sonnet 5.5
Tokens per questionLower is better4563,952Claude Sonnet 5.5
Context windowHigher is better1M500kClaude Sonnet 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 Sonnet 5.5 first, Grok 4.7 second

Verification scorehigher is better
Claude Sonnet 5.578.8%
Grok 4.780.0%
Cost per questionlower is better
Claude Sonnet 5.5$0.0054
Grok 4.7$0.025
Output speedhigher is better
Claude Sonnet 5.5126
Grok 4.777
Time to first tokenlower is better
Claude Sonnet 5.50.7 s
Grok 4.71.9 s
End-to-end response timelower is better
Claude Sonnet 5.56.2 s
Grok 4.78.0 s
Tokens per questionlower is better
Claude Sonnet 5.5456
Grok 4.73,952
Context windowhigher is better
Claude Sonnet 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 Sonnet 5.5Grok 4.7
CreatorAnthropicSpaceXAI
Released28 Sept 202621 Sept 2026
Weights——
ReasoningYesYes
Inputtext, image, filetext, image, file
Outputtexttext
Context window1M tokens500k tokens
Knowledge cutoff——
List price in / out per 1M$2 / $10$2 / $6
Blended price per 1M (3:1)$4.00$3.00
Cheapest hostGoogle · $2 / $10xAI · $2 / $6
Hosts on OpenRouter51
Last tested25 Oct 202627 Oct 2026

Compare any two models →

Claude Sonnet 5.5 vs Grok 4.7: frequently asked questions

Is Claude Sonnet 5.5 better than Grok 4.7?
On accuracy they are statistically tied: Claude Sonnet 5.5 scored 78.8% and Grok 4.7 80.0% on the same 80 questions from open datasets. Similar accuracy; Claude Sonnet 5.5 costs less per question.
Which is cheaper, Claude Sonnet 5.5 or Grok 4.7?
Claude Sonnet 5.5 is cheaper: $0.0054 per question as billed, against $0.025. List prices: Claude Sonnet 5.5 $2 in / $10 out, Grok 4.7 $2 in / $6 out per million tokens.
Which is faster, Claude Sonnet 5.5 or Grok 4.7?
Claude Sonnet 5.5 is faster at 126 output tokens per second, against 77. Time to first token: 0.7 s for Claude Sonnet 5.5, 1.9 s for Grok 4.7.
Which has the larger context window, Claude Sonnet 5.5 or Grok 4.7?
Claude Sonnet 5.5, with 1M tokens against 500k.