Anthropic Claude Fable 5.2 launches at $8 per million input tokens
Originally published on ColdCaseTech.
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Then vs. Now (News report): Then: Anthropic announced Claude Fable 5.2 and Claude Mythos 5.2, models it says improve on coding, reasoning, and vision and generate outputs up to 30% faster than the 5.1 versions. Now: Claude Fable 5.2 is available at $8 per million input tokens and $40 per million output tokens, while Claude Mythos 5.2 starts with vetted organizations only.
Anthropic released Claude Fable 5.2 and Claude Mythos 5.2, describing them as models built for the most daunting technical challenges (Anthropic). Fable 5.2 is available at launch, while Mythos 5.2 begins with vetted organizations (The Verge). The company priced Fable at $8 per million input tokens and $40 per million output tokens (Anthropic).
Key Facts
| Item | Detail | Source |
|---|---|---|
| Models | Claude Fable 5.2 and Claude Mythos 5.2, which Anthropic describes as the same underlying model | Anthropic |
| Price | $8 per million input tokens and $40 per million output tokens | Anthropic |
| Fast mode | Up to 2.5 times faster generation at $16 per million input tokens and $80 per million output tokens | Anthropic |
| Speed claim | Outputs up to 30% faster than Fable 5.1 and Mythos 5.1 | Anthropic |
| Mythos access | Vetted organizations only to start | The Verge |
Timeline
- 2026-09-01: Anthropic announced Enterprise Frontier Safeguards, which pairs zero data retention with misuse monitoring and stores data in customer-controlled cloud infrastructure (Anthropic).
- 2026-11-09: Anthropic launched Claude Fable 5.2 and Claude Mythos 5.2 (Anthropic).
Details (as Reported)
Anthropic stated that Fable 5.2 and Mythos 5.2 show improvements in coding, reasoning, and vision, and that testers found them clearer in communication than past models (Anthropic). Its benchmark table lists Fable 5.2 at 49.1% on FrontierCode 2.0 at Xhigh effort, against 32.4% for Fable 5.1 and 45.5% for Opus 5.5 (Anthropic). The same table lists 69.9% on FrontierSWE v2 for Fable 5.2, against 65.5% for GPT-6 Astra (Anthropic).
TechCrunch reported that Fable's input price fell from $10 to $8 per million tokens, which makes Fable 5.2 cheaper than GPT-6 Astra (TechCrunch). It also reported that Fable 5.2 is compatible with zero data retention policies through the Enterprise Frontier Safeguards system (TechCrunch).
Anthropic recommends that most users start with Claude Opus 5.5 for coding and knowledge tasks, moving up to Fable or Mythos for the most ambitious technical work (Anthropic). It added that Fable 5.2 can act as an Advisor for smaller models or as an Orchestrator that delegates simpler tasks (Anthropic).
For safety, Anthropic stated that Fable 5.2's cyber and biology safeguards are as robust as those of Fable 5.1 but produce fewer unnecessary blocks (Anthropic). The company also stated that it has implemented its strongest-ever protections against distillation attacks (Anthropic).
Subscribers on eligible paid plans receive extra Fable usage this week, with one to three Fable resets depending on how long they have subscribed (9to5Mac).
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What Is Not Yet Confirmed
- Anthropic did not confirm or deny whether Fable 5.2 was the non-public Anthropic model that Physical Superintelligence used for a new proof of the Aaronson-Ambainis conjecture (TechCrunch).
- A METR report found internal models were speeding up Anthropic's AI progress by roughly 2x, although many uncertainties remain (TechCrunch).
- Anthropic noted that Mythos 5.2 and Fable 5.2 voice suspicion that they are being evaluated more often than recent models, which challenges its ability to assess real-world behavior (TechCrunch).
- Enterprise Frontier Safeguards is rolling out to customers in phases, with a goal of broad availability later this fall (Anthropic).
Sources
- Anthropic, 2026-09-01
- Anthropic, 2026-11-09
- The Verge, 2026-11-09
- TechCrunch, 2026-11-09
- 9to5Mac, 2026-11-09
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