Anthropic launches Fable 5.2 and Mythos 5.2: 20% lower prices, up to 30% faster output
Released November 9, Claude Fable 5.2 and Mythos 5.2 improve coding, reasoning and vision, according to Anthropic. Standard API pricing is $8/$40 per million input/output tokens. Fable is broadly available; Mythos requires verification.
Anthropic announced Claude Fable 5.2 and Claude Mythos 5.2 on November 9, 2026, targeting demanding technical work. The company reports improvements in coding, reasoning and vision.
Access and safeguards
Both share an underlying model. Fable includes stronger cybersecurity and biology safeguards for broad availability. Mythos access requires organizational verification through the cybersecurity or life sciences programs.
Pricing and speed
Anthropic reports output generation up to 30% faster than the 5.1 versions.
| Mode | Input per million tokens | Output per million tokens |
|---|---|---|
| Standard | USD 8 | USD 40 |
| Fast mode | USD 16 | USD 80 |
Standard rates are 20% below the previous USD 10/50 prices. Optional Fast mode offers up to 2.5 times the token generation speed and has separate pricing.
Context and API integration
The developer documentation specifies a one-million-token context window, a maximum output of 128,000 tokens and always-on adaptive thinking. API identifiers are claude-fable-5-2 and claude-mythos-5-2; Mythos remains access-restricted.
What to evaluate
Developers should measure task success, latency and total cost on their own workloads before migrating. Lower token prices alone do not establish savings for every workflow.
This report summarizes official announcements and documentation. Performance claims are vendor-reported; TboxIO has not independently tested these models.
Sources
Source labels distinguish official claims, third-party tests, and in-house tests.
- Official claimAnthropic launch announcement (November 9, 2026)
- Official claimClaude Platform Docs: What is new in Fable 5.2