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Claude Fable 5.1 vs Claude Sonnet 5

Compare Claude Fable 5.1 from Anthropic and Claude Sonnet 5 from Anthropic on key metrics including benchmarks, price, context length, and other model features. Access both models and hundreds of others through the AIHubMix API.

AnthropicClaude Fable 5.1AnthropicClaude Sonnet 5
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Anthropic logo
Claude Fable 5.1
Anthropic · text, image, pdf → text

Claude-fable-5-1 is Anthropic's most capable newly released model, suitable for the most demanding reasoning and long-running agent work. Claude Fable 5.1, while keeping input and output prices the same as Claude Fable 5, reduces cache read prices to one quarter of the original and is more capable for long-running agent programming, multi-step research, and document, spreadsheet, and slide processing. (The model is extremely expensive and not recommended for casual use.)

Input$11 /M
Output$55 /M
Cache read$0.275 /M
Details
Anthropic logo
Claude Sonnet 5
Anthropic · text, image, pdf → text

Claude Sonnet 5 is the next generation of Anthropic's Sonnet model family. It is a drop-in upgrade for Claude Sonnet 4.6 with three behavior changes: adaptive thinking is on by default, manual extended thinking now returns a 400 error (it was deprecated on Claude Sonnet 4.6), and setting sampling parameters (temperature, top_p, top_k) to non-default values returns a 400 error

Input$2 /M
Output$10 /M
Details

Pricing & Specifications

Prices are per million tokens. Time to First Token and throughput are rolling averages measured on AIHubMix.

Claude Fable 5.1
Claude Sonnet 5
Input /M
$11
$2
Output /M
$55
$10
Cache read /M
$0.275
-
Context length
1,000,000
1,000,000
Max output
128,000
128,000
Time to First Token
5.1 s
1.0 s
Throughput
60.2 tok/s
7839.1 tok/s
Modalities
textimagepdf
textimagepdf
Supported Parameters
thinkingtoolsfunction callingstructured outputs
thinkingtoolsfunction callingstructured outputs
API Formats
chat_completions · claude_api
chat_completions · gemini_api · claude_api
Released
September 2, 2026
June 30, 2026

Promotional prices show the discounted rate; see each model page for promotion windows.

Activity Past 30 Days

Daily traffic served through AIHubMix — how demand for each model is trending.

claude-fable-5-1claude-sonnet-5

Tokens / day

-

Requests / day

-

Performance Past 3 Days

Measured on real AIHubMix traffic, hourly buckets. Gaps mean no traffic in that hour.

claude-fable-5-1claude-sonnet-5

Throughput (tok/s)

-

TTFT (s)

-

Uptime (%)

-

LMArena Benchmarks

LMArena ratings by capability (Bradley-Terry, commonly called Elo). Higher is better.

Text
claude-fable-5-1claude-sonnet-5
1420146015001540
Overall
14621504
Coding
15171521
Math
14741474
Hard prompts
14901522
Instruction following
14651489
Multi-turn
14721480
Creative writing
14371487
Longer query
14821515
Chinese
14991499
English
14741509
WebDev Arena
claude-fable-5-1claude-sonnet-5
1480160017201840
Overall
15381764
React
15421810
HTML
15251678
Gaming
15751893
Simulations
15481872
Data analytics
14971617

Source: LMArena (arena.ai) leaderboard, imported by AIHubMix. Models without published ratings are omitted per chart.

Cost calculator

Estimate your monthly bill for the same workload on each model.

Claude Sonnet 5
$270 /mo
Claude Fable 5.1
$1,485 /mo

Monthly = daily × 30. Discounted rates applied where a promotion is active.

FAQ

Which is cheaper: Claude Fable 5.1, Claude Sonnet 5?

Claude Sonnet 5: $10/M output tokens; Claude Fable 5.1: $55/M. Use the cost calculator above to estimate your own workload.

How do their coding arena scores compare?

Claude Sonnet 5: 1521; Claude Fable 5.1: 1517 (LMArena coding leaderboard).

Which responds faster?

Claude Sonnet 5: 1.0s time to first token measured on AIHubMix; see the live performance charts above for how each model behaves across the day.

How large is each context window?

Claude Fable 5.1 accepts 1,000,000 and Claude Sonnet 5 accepts 1,000,000 input tokens. Maximum output per request is 128,000 tokens on Claude Fable 5.1 and 128,000 tokens on Claude Sonnet 5.

Which one generates tokens faster?

Claude Sonnet 5 at 7839.1 tok/s and Claude Fable 5.1 at 60.2 tok/s, measured as output throughput on AIHubMix — a separate metric from time to first token.

What inputs and capabilities does each model support?

Claude Fable 5.1 accepts text, image and PDF input and supports thinking, tool calling, function calling and structured outputs; Claude Sonnet 5 accepts text, image and PDF input and supports thinking, tool calling, function calling and structured outputs.

Can I call Claude Fable 5.1 and Claude Sonnet 5 with the same API key?

Yes. AIHubMix serves every model on this page behind one OpenAI-compatible endpoint, so switching between them is a one-line change to the model field — no second account, key or SDK.

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