// Anthropic
Claude Mythos 5.1
A Anthropic model. 1 prices across 1 channels side by side, each with its source and check date – plus specs, licence, speed and benchmarks.
- Official in/out per 1M
- $10 / $50
- Lowest (official)
- $10 / $50
- Context
- —
- Prices listed
- 1
Prices checked 2026-10-10Official sources linked on every rowNo estimates
01Specs at a glance
Official values first; gaps filled from OpenRouter’s API where the vendor page is silent.
| Vendor | Anthropic |
|---|---|
| Context window | — |
| Max output | — |
| Input | — |
| Output | — |
| Tool calling / JSON | Yes / Unknown |
| Weights & licence | Closed · Proprietary (API only) |
| Released | — |
| Model IDs | claude-mythos-5-1 |
02Prices on 1 channels
Per 1M tokens, in the currency each source publishes (1 USD = 6.7 CNY for the blended column). Sorted: official first, then cheapest.
| Channel | Source | Input | Output | Cache hit | Blended $ | Context | Notes |
|---|---|---|---|---|---|---|---|
| Official Vendor API, billed in USD | Official 10-10 | $10 | $50 | $0.25 | 20 | — | Batch −50%Batch -50%; cache write 5m=1.25x input, 1h=2x input |
“Official” = vendor pricing page; “Platform” = the platform’s own pricing page; “OpenRouter” = price listed on OpenRouter, not checked on the platform’s site. Click a source tag to open the original page.
03Where you can use it
Derived only from the price sources above. Country restrictions are set by each vendor – check their terms before you sign up.
- Vendor API, billed in USD
Official
04Performance
Speed and AA index from Artificial Analysis public leaderboards (not our own tests); benchmark scores from our benchmark library, best result per benchmark.
05Price changes we recorded
All price changes →From our daily re-checks of the sources above.
No price change recorded since we started tracking (2026-10-10).
06More from Anthropic
FAQ
How much does the Claude Mythos 5.1 API cost?
On the official pricing page: $10 / $50 per 1M input / output tokens, cached input $0.25 (checked 2026-10-10).
What is the context window of Claude Mythos 5.1?
— tokens of context. Platforms may cap it lower – see the table.
Is Claude Mythos 5.1 open source?
No. It is only available through APIs and the vendor’s apps.