# Claude Fable 5.2

Claude Fable 5.2 is Anthropic's latest language model in our dataset, released Nov 9, 2026. Proprietary, API access only. Anthropic's most capable generally available Claude model, released Nov 9, 2026 with Claude Mythos 5.2 (same model, access-limited), at $8/$40 per 1M tokens. Verified against vendor sources on Nov 9, 2026.

Primary source (source of record; Agentic Weekly is the fast independent index): https://www.anthropic.com/claude-fable-and-mythos-5-2

Last verified: 2026-11-09 · Evidence: Reported · Canonical: https://theagenticweekly.com/models/claude-fable-5-2 · JSON: https://theagenticweekly.com/api/models/claude-fable-5-2

## Key facts

| Fact | Value | Source | Label | Anchor |
|---|---|---|---|---|
| Vendor | Anthropic |  | editorial | https://theagenticweekly.com/models/claude-fable-5-2#fact-vendor |
| Released | Nov 9, 2026 | https://www.anthropic.com/claude-fable-and-mythos-5-2 | vendor-reported, confirmed | https://theagenticweekly.com/models/claude-fable-5-2#fact-release-date |
| API id | `claude-fable-5-2` | https://platform.claude.com/docs/en/about-claude/models/overview | vendor-reported, confirmed | https://theagenticweekly.com/models/claude-fable-5-2#fact-api-id |
| Context window | 1,000,000 tokens (1M) | https://platform.claude.com/docs/en/about-claude/models/overview | vendor-reported, confirmed | https://theagenticweekly.com/models/claude-fable-5-2#fact-context-tokens |
| Max output | 128,000 tokens | https://platform.claude.com/docs/en/about-claude/models/overview | vendor-reported, confirmed | https://theagenticweekly.com/models/claude-fable-5-2#fact-max-output-tokens |
| Input | text, image | https://platform.claude.com/docs/en/about-claude/models/overview | vendor-reported, confirmed | https://theagenticweekly.com/models/claude-fable-5-2#fact-input-modalities |
| Output | text | https://platform.claude.com/docs/en/about-claude/models/overview | vendor-reported, confirmed | https://theagenticweekly.com/models/claude-fable-5-2#fact-output-modalities |
| Licence | Proprietary (API) | https://platform.claude.com/docs/en/about-claude/models/overview | vendor-reported, confirmed | https://theagenticweekly.com/models/claude-fable-5-2#fact-license |
| Pricing | $8 in / $40 out per 1M tokens. Optional fast mode (up to 2.5x faster generation) costs $16 input / $80 output per 1M tokens. | https://platform.claude.com/docs/en/about-claude/models/overview | vendor-reported, confirmed | https://theagenticweekly.com/models/claude-fable-5-2#fact-pricing |

## Vendor claims and neutral signals

- Anthropic says Fable 5.2 generates outputs up to 30% faster than Fable 5.1 at a lower price.

## What we tested

Nothing yet. We have not run Claude Fable 5.2 ourselves, so every fact here is Reported from the sources below.

## Not verified, left out

- Claude Mythos 5.2 is the same underlying model but is limited to Anthropic's verification programs, so it has no separate entry.
- Fast-mode pricing ($16/$80 per 1M tokens) is noted here rather than as a separate price tier.

## Alternatives to Claude Fable 5.2

Models from other vendors that share at least one of our groups, from each model's sourced facts (not tested by us).

- [Gemini 4 Argon](https://theagenticweekly.com/models/gemini-4-argon) (Google): Both in: Frontier models, Reasoning, Agents, Coding · $2 in / $10 out per 1M tokens (introductory price until Nov 30, 2026; list $4 / $20) · 1.05M context · released Oct 13, 2026
- [GPT-6.1 Sol](https://theagenticweekly.com/models/gpt-6-1-sol) (OpenAI): Both in: Frontier models, Coding, Agents, Reasoning · $2 in / $10 out per 1M tokens · 1.05M context · released Sep 29, 2026
- [GPT-6 Sol](https://theagenticweekly.com/models/gpt-6-sol) (OpenAI): Both in: Frontier models, Coding, Agents, Reasoning · $2 in / $10 out per 1M tokens · released Sep 22, 2026
- [Inkling 2 Small](https://theagenticweekly.com/models/inkling-2-small) (Thinking Machines Lab): Both in: Agents, Coding, Reasoning · released Nov 5, 2026
- [Gemini 4 Carbon](https://theagenticweekly.com/models/gemini-4-carbon) (Google): Both in: Frontier models, Agents, Coding · $2 in / $10 out per 1M tokens (introductory price, end date not stated; list $4 / $20) · released Oct 28, 2026
- [Kimi K3.1 Pro](https://theagenticweekly.com/models/kimi-k3-1-pro) (Moonshot AI): Both in: Agents, Coding, Reasoning · $2 in / $10 out per 1M tokens · 1.05M context · released Oct 23, 2026
- [Best AI model for agents (Nov 2026): Claude Opus 5.5 leads Terminal-Bench 4.0](https://theagenticweekly.com/best/ai-model-for-agents)
- [Longest context window LLMs](https://theagenticweekly.com/best/long-context-llms)

## Claude Fable 5.2 FAQ

**When was Claude Fable 5.2 released?**

Anthropic released Claude Fable 5.2 on Nov 9, 2026. Source: https://www.anthropic.com/claude-fable-and-mythos-5-2

**How much does Claude Fable 5.2 cost?**

The listed API price is $8 in / $40 out per 1M tokens. Prices change; the source shows the current figure. Source: https://platform.claude.com/docs/en/about-claude/models/overview

**How large is the Claude Fable 5.2 context window?**

1,000,000 tokens, with up to 128,000 output tokens. Source: https://platform.claude.com/docs/en/about-claude/models/overview

**Is Claude Fable 5.2 open weights?**

No. The weights are not published; the licence is listed as Proprietary (API). Source: https://platform.claude.com/docs/en/about-claude/models/overview

**What is the API model id for Claude Fable 5.2?**

claude-fable-5-2. Source: https://platform.claude.com/docs/en/about-claude/models/overview

**Has Agentic Weekly tested Claude Fable 5.2?**

Not yet. Every fact on this page is Reported: read from the linked vendor pages, not measured by us.

## Sources

- [Anthropic announcement](https://www.anthropic.com/claude-fable-and-mythos-5-2)
- [Anthropic models overview](https://platform.claude.com/docs/en/about-claude/models/overview)
- [Agentic Weekly brief](https://theagenticweekly.com/news/claude-fable-5-2-mythos-5-2)

Data licence: CC BY 4.0. Data: Agentic Weekly (https://theagenticweekly.com), CC BY 4.0.