Claude Mythos 5
Anthropic
- Context window
- 1M 1,000,000 tokens
- Max output
- 128K 128,000 tokens
- Input / Output
- image, pdf, text → text
API pricing
USD / 1M tokens
| Input | Output | Cached input |
|---|---|---|
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Input / output price · USD / 1M tokens
Timeline
Related signals: Claude Mythos 5.2
- · Evidence links · Anthropic · official articles
- · Evidence links · Anthropic · official articles
- · Evidence links · Claude Code · changelog
- · Alex's posts · Alex Getman
Excerpt
Be like Dario Amodei > Spend months warning everyone about Mythos 5 > Then release a nerfed version called Fable 5 > Send everyone into a panic > Then start wondering whether to shut the model down entirely > A couple of weeks later, drop Opus 5 > Which beats Fable at half the price
- · Alex's posts · Alex Getman
Excerpt
Claude Fable is back! Anthropic has lifted restrictions on Claude Fable 5 and Mythos 5 after a decision by the US government. Fable will be available to Claude users again starting today. Until July 7, the model is included in weekly limits. After that, access will move to API. The restriction started after an Amazon report: researchers found a way to bypass Fable’s safeguards in cybersecurity tasks. Anthropic says the bypass did not unlock Mythos-level capabilities. The company has already added a new safety classifier that blocks this method in more than 99% of cases. Anthropic is also preparing a common standard for evaluating AI jailbreaks.
Specifications
Claude Mythos 5 is a model from Anthropic, first recorded on 7 Oct 2026; its release date is not established. The context window is 1,000,000 tokens. The maximum output is 128,000 tokens. Pricing is $10.00 per million input tokens and $50.00 per million output tokens.
- Context window
- 1,000,000
- Max output
- 128,000
- Input
- image · pdf · text
- Output
- text
- Input · USD / 1M tokens
- $10.00
- Output · USD / 1M tokens
- $50.00
- Cached input · USD / 1M tokens
- $1.00
Questions
What is the context window of Claude Mythos 5?
The context window is 1,000,000 tokens. The maximum output is 128,000 tokens.
How much does Claude Mythos 5 cost?
Pricing is $10.00 per million input tokens and $50.00 per million output tokens. Cached input is $1.00 per million.
When was Claude Mythos 5 released?
Its release date is not established. Signal Forge first recorded it on 7 Oct 2026.