ResearchLLM Verifications Leaderboard

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

Head to head · tested 27 Oct 2026

Claude Fable 5.1 vs Grok 4.7: accuracy, speed and price

Similar accuracy; Claude Fable 5.1 costs less per question.

AnthropicClaude Fable 5.181.2% score · #5$0.016 per question70 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 Fable 5.1 scored 81.2% and Grok 4.7 80.0% on the same 80 questions, a gap within what chance alone could produce.
  • Claude Fable 5.1 is 1.6× cheaper per question as billed ($0.016 vs $0.025), reasoning tokens included.
  • Output speed is similar (70 vs 77 tokens per second).
  • Grok 4.7 starts answering sooner: 1.9 s to the first token, against 2.1 s for Claude Fable 5.1.
  • Claude Fable 5.1 accepts more context: 1M tokens against 500k.

Which should you choose?

Choose Claude Fable 5.1 for the lower cost per correct answer ($0.02 against $0.031), shorter outputs (about 238 tokens per question against 3,952), a 1M-token context window and more hosts to choose from on OpenRouter (4 against 1). Choose Grok 4.7 for a quicker first token.

Accuracy gap +1.2 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 Fable 5.1Grok 4.7Edge
Verification scoreHigher is better81.2%80.0%Too close to call
Cost per questionLower is better$0.016$0.025Claude Fable 5.1
Output speedHigher is better7077Similar
Time to first tokenLower is better2.1 s1.9 sGrok 4.7
End-to-end response timeLower is better11.0 s8.0 sGrok 4.7
Tokens per questionLower is better2383,952Claude Fable 5.1
Context windowHigher is better1M500kClaude Fable 5.1

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 Fable 5.1 first, Grok 4.7 second

Verification scorehigher is better
Claude Fable 5.181.2%
Grok 4.780.0%
Cost per questionlower is better
Claude Fable 5.1$0.016
Grok 4.7$0.025
Output speedhigher is better
Claude Fable 5.170
Grok 4.777
Time to first tokenlower is better
Claude Fable 5.12.1 s
Grok 4.71.9 s
End-to-end response timelower is better
Claude Fable 5.111.0 s
Grok 4.78.0 s
Tokens per questionlower is better
Claude Fable 5.1238
Grok 4.73,952
Context windowhigher is better
Claude Fable 5.11M
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 405BClaude Fable 5.1Grok 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 SolGPT-6 Lunagpt-oss-120bLlama 4 MaverickQwen3.8 Max (0902)

Specifications and pricing

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

SpecificationClaude Fable 5.1Grok 4.7
CreatorAnthropicSpaceXAI
Released1 Sept 202621 Sept 2026
Weights——
ReasoningYesYes
Inputtext, image, filetext, image, file
Outputtexttext
Context window1M tokens500k tokens
Knowledge cutoff——
List price in / out per 1M$10 / $50$2 / $6
Blended price per 1M (3:1)$20.00$3.00
Cheapest hostAzure · $10 / $50xAI · $2 / $6
Hosts on OpenRouter41
Last tested27 Oct 202627 Oct 2026

Compare any two models →

Claude Fable 5.1 vs Grok 4.7: frequently asked questions

Is Claude Fable 5.1 better than Grok 4.7?
On accuracy they are statistically tied: Claude Fable 5.1 scored 81.2% and Grok 4.7 80.0% on the same 80 questions from open datasets. Similar accuracy; Claude Fable 5.1 costs less per question.
Which is cheaper, Claude Fable 5.1 or Grok 4.7?
Claude Fable 5.1 is cheaper: $0.016 per question as billed, against $0.025. List prices: Claude Fable 5.1 $10 in / $50 out, Grok 4.7 $2 in / $6 out per million tokens.
Which is faster, Claude Fable 5.1 or Grok 4.7?
Their output speed is similar: 70 and 77 tokens per second.
Which has the larger context window, Claude Fable 5.1 or Grok 4.7?
Claude Fable 5.1, with 1M tokens against 500k.