Compare Claude Fable 5 from Anthropic and Claude Fable 5.1 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.
Claude Fable 5Claude Fable 5.1Anthropic's most capable widely released model, for the most demanding reasoning and long-horizon agentic work（This model is extremely expensive and is not recommended for casual use.）
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.)
Prices are per million tokens. Time to First Token and throughput are rolling averages measured on AIHubMix.
Promotional prices show the discounted rate; see each model page for promotion windows.
Daily traffic served through AIHubMix — how demand for each model is trending.
Measured on real AIHubMix traffic, hourly buckets. Gaps mean no traffic in that hour.
LMArena ratings by capability (Bradley-Terry, commonly called Elo). Higher is better.
Source: LMArena (arena.ai) leaderboard, imported by AIHubMix. Models without published ratings are omitted per chart.
Estimate your monthly bill for the same workload on each model.
Monthly = daily × 30. Discounted rates applied where a promotion is active.
Claude Fable 5: $55/M output tokens; Claude Fable 5.1: $55/M. Use the cost calculator above to estimate your own workload.
Claude Fable 5: 1551; Claude Fable 5.1: 1517 (LMArena coding leaderboard).
Claude Fable 5: 2.4s time to first token measured on AIHubMix; see the live performance charts above for how each model behaves across the day.
Claude Fable 5 accepts 1,000,000 and Claude Fable 5.1 accepts 1,000,000 input tokens. Maximum output per request is 128,000 tokens on Claude Fable 5 and 128,000 tokens on Claude Fable 5.1.
Claude Fable 5 at 68.1 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.
Claude Fable 5 accepts text, image and PDF input and supports thinking, tool calling, function calling and structured outputs; Claude Fable 5.1 accepts text, image and PDF input and supports thinking, tool calling, function calling and structured outputs.
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