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Model comparison - Same provider, successor

Claude Fable 5 vs Claude Fable 5.1

Claude Fable 5 and Claude Fable 5.1 are both Anthropic models. Both list the same first-party API price: $10 per 1M input tokens and $50 per 1M output tokens. Claude Fable 5 and Claude Fable 5.1 both have a 1,000,000-token context window, and both return up to 128,000 output tokens per response. Claude Fable 5 was released on June 9, 2026 and Claude Fable 5.1 on September 1, 2026. Both are closed-weights models, available only through an API.

Last verified from each provider's pricing page. All sources

Anthropic - Closed

Claude Fable 5
Input / 1M
$10
Output / 1M
$50
Context
1M

Anthropic - Closed

Claude Fable 5.1
Input / 1M
$10
Output / 1M
$50
Context
1M

Side-by-side specs

SpecClaude Fable 5Claude Fable 5.1
ProviderAnthropicAnthropic
Input / 1M tokens$10$10
Output / 1M tokens$50$50
Cache read / 1M$1$0.25
Cache write / 1M$12.50$12.50
Batch input / 1M$5$5
Batch output / 1M$25$25
Context window1,000,0001,000,000
Max output128,000128,000
Release date
WeightsClosedClosed
API model idclaude-fable-5claude-fable-5-1
AI Gateway idanthropic/claude-fable-5anthropic/claude-fable-5.1
Last verified

Prices in USD per 1M tokens at each provider's standard first-party rate. A dash means the provider does not bill that item separately or no primary page states it.

What each costs in practice

The same three workloads every model page uses, worked from each model's standard list rates. Swap in your own token counts with the math on each model's page.

WorkloadClaude Fable 5Claude Fable 5.1
One agent session1M input tokens and 100K output tokens, no caching.$15.00$15.00
A chat app10,000 requests a day at 2K input and 500 output tokens each.$450.00$13,500.00 per 30-day month$450.00$13,500.00 per 30-day month
The same session at a 90% cache hit90% of the input is read from the prompt cache. The one-time cache write premium is not included.$6.90$6.23
Show the math

Claude Fable 5

  • One agent sessionInput: 1M x $10 = $10.00Output: 0.1M x $50 = $5.00
  • A chat appInput: 20M x $10 = $200.00Output: 5M x $50 = $250.00
  • The same session at a 90% cache hitCached input: 0.9M x $1 = $0.90Uncached input: 0.1M x $10 = $1.00Output: 0.1M x $50 = $5.00

Claude Fable 5.1

  • One agent sessionInput: 1M x $10 = $10.00Output: 0.1M x $50 = $5.00
  • A chat appInput: 20M x $10 = $200.00Output: 5M x $50 = $250.00
  • The same session at a 90% cache hitCached input: 0.9M x $0.25 = $0.225Uncached input: 0.1M x $10 = $1.00Output: 0.1M x $50 = $5.00

Benchmarks under the same setting

Only boards that list both models under the same run setting appear here, one row per board and setting, with each score exactly as the board shows it. Scores on different boards use different scales and are never combined.

Board and settingClaude Fable 5Claude Fable 5.1
ARC-AGI-2reasoning level: MaxOfficial leaderboard - arcprize.org89.2%90.0%
ARC-AGI-2reasoning level: XHighOfficial leaderboard - arcprize.org88.3%90.0%
ARC-AGI-2reasoning level: HighOfficial leaderboard - arcprize.org87.5%88.8%
LMArena Text (Text Arena Overall)Text Arena Overall, default leaderboard view (8,834,211 votes, 416 models)Official leaderboard - arena.ai1504±41502±6
LMArena WebDev (Code Arena WebDev Overall)Code Arena WebDev Overall, default leaderboard view (891,922 votes, 145 models)Official leaderboard - arena.ai1625+6/-61741+9/-9
Terminal-Bench 4.0agent: Claude Code; effort: maxOfficial leaderboard - tbench.ai44.5% ± 3.8%57.9% ± 3.8%

Model pages

AnthropicClaude Fable 5 pricing and specsFull rate card, worked cost examples and sources. Closed weights.AnthropicClaude Fable 5.1 pricing and specsFull rate card, worked cost examples and sources. Closed weights.

FAQ

How do Claude Fable 5 and Claude Fable 5.1 compare on price?

Both list the same first-party API price: $10 per 1M input tokens and $50 per 1M output tokens. For one agent session of 1M input and 100K output tokens with no caching, that is $15.00 on Claude Fable 5 and $15.00 on Claude Fable 5.1. Prices are each provider's first-party list rates, verified October 17, 2026 and October 17, 2026.

What are the context windows of Claude Fable 5 and Claude Fable 5.1?

Claude Fable 5 and Claude Fable 5.1 both have a 1,000,000-token context window, and both return up to 128,000 output tokens per response.

Are Claude Fable 5 and Claude Fable 5.1 open weights?

Claude Fable 5 is closed-weights and is called through Anthropic's API as claude-fable-5. Claude Fable 5.1 is closed-weights and is called through Anthropic's API as claude-fable-5-1.

More comparisons

Sources

Claude Fable 5 verified from platform.claude.com; Claude Fable 5.1 verified from platform.claude.com. This page is as current as the older of the two: .

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