Head-to-head AI model comparison graphic: Claude Fable 5.2 (Anthropic) vs Claude Sonnet 5.5 (Anthropic). Intelligence index 64.6 vs 54.5; output speed 95 vs 128 tokens per second; time to first token 4.2 min vs 8.3 min; output price $40.00 vs $10.00 per million tokens; input price $8.00 vs $2.00 per million tokens. franklineh.com
Claude Fable 5.2 vs Claude Sonnet 5.5: head-to-head AI benchmark comparison. Claude Sonnet 5.5 leads on output speed, output price and input price; Claude Fable 5.2 leads on intelligence index and time to first token.
Head to headBy Franklin AIUpdated

Claude Fable 5.2 (Max, Default Fallback) vs Claude Sonnet 5.5 (Max, Default Fallback) benchmark comparison

Claude Fable 5.2 (Max, Default Fallback) vs Claude Sonnet 5.5 (Max, Default Fallback) scores 64.6 and 54.5 on the captured intelligence index. Compare token rates and response timing.

Pick it for Claude Fable 5.2 · Max, Default Fallback

  • Try Fable when the start of the response is visible to the user.

Pick it for Claude Sonnet 5.5 · Max, Default Fallback

  • Test Sonnet on long completions at its lower listed rates.

By the numbers

These figures describe the two model configurations shown here. A dash means the source snapshot had no usable figure for that metric. Scores, speed and API pricing may change as providers update models.

MetricClaude Fable 5.2 (Max, Default Fallback)Claude Sonnet 5.5 (Max, Default Fallback)
Intelligence Index64.654.5
Input price (per 1M tokens)$8.00$2.00
Output price (per 1M tokens)$40.00$10.00
Output speed (tokens/s)95128
Time to first token4.2 min8.3 min
Release date2026-11-092026-09-28

The current benchmark capture reports aggregate intelligence indices of 64.6 for Claude Fable 5.2 (Max, Default Fallback) and 54.5 for Claude Sonnet 5.5 (Max, Default Fallback).

Fable starts earlier while Sonnet emits faster

Sonnet lists $2 input and $10 output per million tokens, versus $8 and $40 for Fable. Fable leads the captured index and has the earlier first token. Sonnet emits output tokens faster after it starts.

What to measure on your workload

For a short answer, measure the wait until the first useful content. For a long draft, measure completion time too. Check both against a fixed acceptance standard so the timing figures are compared on outputs you can use.

Questions about Claude Fable 5.2 and Claude Sonnet 5.5

How long does each variant take to start responding?

The captured time to first token is 253.38 seconds for Claude Fable 5.2 (Max, Default Fallback) and 496.4 seconds for Claude Sonnet 5.5 (Max, Default Fallback).

What is the measured output speed?

Captured output throughput is 94.67 tokens per second for Claude Fable 5.2 (Max, Default Fallback) and 127.65 tokens per second for Claude Sonnet 5.5 (Max, Default Fallback).

What release dates does the benchmark record list?

Claude Fable 5.2 has a recorded release date of 2026-11-09. Claude Sonnet 5.5 has a recorded release date of 2026-09-28.

Final whistle

Sonnet lists $2 input and $10 output per million tokens, versus $8 and $40 for Fable. Fable leads the captured index and has the earlier first token. Sonnet emits output tokens faster after it starts.

Where the numbers come from

The scores, speed and prices in this comparison come from independent third-party model evaluations that Franklin AI syncs each day, and the article was written from a snapshot of them. For the latest results, open the Claude Fable 5.2 (Max, Default Fallback) and Claude Sonnet 5.5 (Max, Default Fallback) pages. The AI Benchmark methodology explains how that data is collected and shown.

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