Anthropic released Claude Fable 5.2 and Mythos 5.2 on November 9 at $8 per million input tokens and $40 per million output, down from $10 and $50 for 5.1. Pro and Team standard seats get Fable in their plan through November 16. Opus 5.5 is still Anthropic's recommended default, at half the price.
If you pay for Claude Fable on the API, your bill for the same work drops 20% when you switch to Fable 5.2. Anthropic released Claude Fable 5.2 and Claude Mythos 5.2 on Monday, November 9, at $8 per million input tokens and $40 per million output tokens. Fable 5.1 cost $10 and $50. If you are on Claude Pro, you can try Fable inside your plan until November 16.
What Anthropic released
According to Anthropic’s announcement, Fable and Mythos are the same underlying model. Fable carries cybersecurity and biology safeguards and is open to everyone. Mythos is for organizations approved through Anthropic’s Cyber and Life Sciences Verification Programs.
- Speed. Anthropic says the 5.2 models generate output up to 30% faster than 5.1.
- Fast mode. An optional mode speeds token generation by up to 2.5 times, at $16 input and $80 output per million tokens.
- Where. Fable 5.2 is available on the Claude Platform as
claude-fable-5-2, and on Amazon Web Services, Google Cloud and Microsoft Azure. - Safeguards. Anthropic says Fable 5.2’s cyber and biology blocks are as strong as 5.1’s but trigger fewer unnecessary refusals.
What it costs
From Anthropic’s pricing page, read November 9, 2026:
| Model | Input, per million tokens | Output, per million tokens |
|---|---|---|
| Fable 5.2 and Mythos 5.2 | $8 | $40 |
| Fable 5.2 fast mode | $16 | $80 |
| Fable 5.2 Batch API | $4 | $20 |
| Fable 5.1 and Mythos 5.1 | $10 | $50 |
| Opus 5.5 | $4 | $20 |
| Sonnet 5.5 | $2 | $10 |
A worked example: a job that reads 200,000 tokens and writes 20,000 costs $3.00 on Fable 5.1, $2.40 on Fable 5.2 and $1.20 on Opus 5.5. Prompt cache hits on Fable 5.2 cost $0.20 per million tokens, down from $0.25.
Pro users get Fable for one week
A Claude support article lays out the launch promotion:
- Pro plans and Team standard seats. All Fable models are included in your weekly limits from November 9 through November 16 at 11:59 pm PT, up to 50% of the weekly limit, plus one Fable limit reset.
- Max, Ultra and Team premium seats. One to three Fable limit resets, depending on how long you have paid: one under six months, two for six to 12 months, three past 12 months. They expire March 8, 2027.
- Who qualifies. Paid billing must have been in place before 10:00 am PT on November 9. Free plans and some Enterprise plans are excluded.
A reset gives back the weekly usage you spent on Fable models and refills a five-hour window if your account has one. It does not raise your limits. Plan prices are in our Claude Ultra plan story.
Opus 5.5 stays the default for most work
Anthropic itself recommends that most coding and knowledge work start on Opus 5.5, then move up to Fable or Mythos only when a task needs it. Its own benchmark supports that advice for a lot of jobs. On FrontierCode 2.0, which tests whether maintainers would merge a model’s code changes, Anthropic reports Fable 5.2 at High effort scoring 45.3% against 45.5% for Opus 5.5 at its highest effort, for roughly half the cost per task. At its top Xhigh setting, Fable 5.2 scored 49.1%, the best result Anthropic has measured from a released model. These are Anthropic’s figures; we have not seen independent tests yet.
Our read: if your team already runs Fable 5.1 through the API, switch the model string to claude-fable-5-2 and take the 20% cut. If you run Opus 5.5 today, the price gap is still two to one per token. Move up only the tasks that fail on Opus, such as long migrations or hard multi-step research. Pro subscribers have seven days to test that on their own work at no extra cost.