Claude Fable 5 vs Claude Sonnet 4.5
Side-by-side benchmark comparison across coding, math, reasoning, speed, and pricing.
Claude Fable 5 by Anthropic and Claude Sonnet 4.5 by Anthropic are evenly matched across 11 benchmarks. 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 scores 49.7 on AA Intelligence Index compared to Claude Sonnet 4.5's 21.2.
Coding: In coding, Claude Fable 5 scores 95.0% on SWE-bench Verified compared to Claude Sonnet 4.5's 77.2%, while Claude Fable 5 scores 76.5 on AA Coding Index compared to Claude Sonnet 4.5's 52.1.
Reasoning: In reasoning, Claude Fable 5 scores 92.6% on GPQA Diamond compared to Claude Sonnet 4.5's 83.4%, while Claude Fable 5 scores 51 on AA Agentic Index compared to Claude Sonnet 4.5's 17.5.
Context: In context, both score 1.0M on Context Length.
Pricing Comparison
Claude Fable 5 costs $10.0/1M input tokens and $50.0/1M output tokens, while Claude Sonnet 4.5 costs $3.0/1M input and $15.0/1M output. Claude Sonnet 4.5 is the more affordable option for API usage.
Speed Comparison
Claude Fable 5 generates output at 60 tok/s compared to Claude Sonnet 4.5's 67 tok/s, and the time to first token is 81680 ms for Claude Fable 5 versus 1170 ms for Claude Sonnet 4.5. Claude Sonnet 4.5 delivers faster throughput.
Verdict
For developers prioritizing coding, Claude Fable 5 has the edge. For those who value affordability and speed, Claude Sonnet 4.5 is the stronger choice.
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Claude Fable 5 vs Claude Sonnet 4.5 — FAQ
Which is better, Claude Fable 5 or Claude Sonnet 4.5?
Claude Fable 5 and Claude Sonnet 4.5 are evenly matched across benchmarks. The best choice depends on your specific priorities such as coding ability, speed, or pricing.
How does Claude Fable 5 compare to Claude Sonnet 4.5 for coding?
Claude Fable 5 is better for coding, scoring 95.0% on SWE-bench Verified compared to 77.2%. SWE-bench tests real-world software engineering by resolving actual GitHub issues.
Is Claude Fable 5 cheaper than Claude Sonnet 4.5?
Yes, Claude Sonnet 4.5 is cheaper. Claude Fable 5 costs $10.0/1M input and $50.0/1M output tokens. Claude Sonnet 4.5 costs $3.0/1M input and $15.0/1M output tokens.
Which is faster, Claude Fable 5 or Claude Sonnet 4.5?
Claude Sonnet 4.5 is faster, generating output at 67 tok/s compared to 60 tok/s. Faster output speed means shorter wait times for API responses.
What benchmarks does the Claude Fable 5 vs Claude Sonnet 4.5 comparison cover?
This comparison covers 11 benchmarks including GPQA Diamond, SWE-bench Verified, Output Speed, Time to First Token, Input Cost, Output Cost, Context Length, AA Intelligence Index, and more. Metrics span general intelligence, coding, math, reasoning, speed, and cost categories.