Claude Fable 5.1 vs Gemini 2.5 Pro
Side-by-side benchmark comparison across coding, math, reasoning, speed, and pricing.
Claude Fable 5.1 by Anthropic wins on 7 of 11 benchmarks against Gemini 2.5 Pro by Google, which leads on 4. This head-to-head comparison covers coding, math, reasoning, speed, and pricing metrics from our benchmark data.
Category-by-Category Breakdown
General Intelligence: In general intelligence, Claude Fable 5.1 scores 53.4 on AA Intelligence Index compared to Gemini 2.5 Pro's 16.7.
Coding: In coding, Claude Fable 5.1 scores 81.6 on AA Coding Index compared to Gemini 2.5 Pro's 33.3, while Claude Fable 5.1 scores 1360 on Design Arena ELO compared to Gemini 2.5 Pro's 1164, while Claude Fable 5.1 scores 1322 on Website Arena ELO compared to Gemini 2.5 Pro's 1179.
Reasoning: In reasoning, Claude Fable 5.1 scores 90.0% on GPQA Diamond compared to Gemini 2.5 Pro's 79.9%, while Claude Fable 5.1 scores 58 on AA Agentic Index compared to Gemini 2.5 Pro's 3.5, while Claude Fable 5.1 scores 78.0% on τ²-Bench Airline compared to Gemini 2.5 Pro's 61.3%.
Context: In context, Gemini 2.5 Pro scores 1.0M on Context Length compared to Claude Fable 5.1's 1.0M.
Pricing Comparison
Claude Fable 5.1 costs $10.0/1M input tokens and $50.0/1M output tokens, while Gemini 2.5 Pro costs $1.3/1M input and $10.0/1M output. Gemini 2.5 Pro is the more affordable option for API usage.
Verdict
Gemini 2.5 Pro leads across the board in affordability, making it the stronger overall choice in this comparison.
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Claude Fable 5.1 vs Gemini 2.5 Pro — FAQ
Which is better, Claude Fable 5.1 or Gemini 2.5 Pro?
Claude Fable 5.1 wins on more benchmarks overall (7 vs 4). However, the best choice depends on your specific needs — each model excels in different areas.
How does Claude Fable 5.1 compare to Gemini 2.5 Pro for coding?
SWE-bench Verified data is not available for both models. Check the detailed comparison charts above for other coding-related metrics.
Is Claude Fable 5.1 cheaper than Gemini 2.5 Pro?
Yes, Gemini 2.5 Pro is cheaper. Claude Fable 5.1 costs $10.0/1M input and $50.0/1M output tokens. Gemini 2.5 Pro costs $1.3/1M input and $10.0/1M output tokens.
Which is faster, Claude Fable 5.1 or Gemini 2.5 Pro?
Output speed data is not available for both models. Check the speed section of the comparison above for available performance data.
What benchmarks does the Claude Fable 5.1 vs Gemini 2.5 Pro comparison cover?
This comparison covers 11 benchmarks including GPQA Diamond, Input Cost, Output Cost, Context Length, AA Intelligence Index, AA Coding Index, AA Agentic Index, Cached Input Cost, and more. Metrics span general intelligence, coding, math, reasoning, speed, and cost categories.