text model comparison
Claude Mythos 5.1 vs Claude Mythos 5.2
Claude Mythos 5.1 and Claude Mythos 5.2 are both current text models, from Anthropic. Claude Mythos 5.2 is 20% cheaper per 1M input tokens than Claude Mythos 5.1, $8 vs $10.
- Lower price per 1M input tokens
- Claude Mythos 5.2$8 against $10
- Newer release
- Claude Mythos 5.2Nov 2026 against Sep 2026
Data verified November 10, 2026 · Dataset 2026-11-10
Side by side
Claude Mythos 5.1 and Claude Mythos 5.2, line by line
Prices in effect today, compared at the same tier wherever both list one. The better value in each row is highlighted.
| Fact | Claude Mythos 5.1 | Claude Mythos 5.2 |
|---|---|---|
| Price | ||
| Price per 1M input tokens | $10 | $8 (better) |
| Price per 1M output tokens | $50 | $40 (better) |
| Specs | ||
| Provider | Anthropic | Anthropic |
| Release date | September 1, 2026 | November 9, 2026 |
| Access | API only | limited access |
| Context window | Not reported | 1,000,000 tokens |
| Max output | Not reported | 128,000 tokens |
| Input | text, image | text, image |
| Output | text | text |
Charts
Against every current text model
Where Claude Mythos 5.1 and Claude Mythos 5.2 land among the current models of their task, on every independent benchmark, on price and on context.
Where each stands
No independent benchmark has scored either model yet, so the tiles rank their prices among the current models of their task.
Price and context
Price per 1M input tokens
Claude Mythos 5.1:#55of 61
$10 · cheaper than 5%
Claude Mythos 5.2:#53of 61
$8 · cheaper than 12%
Price per 1M output tokens
Claude Mythos 5.1:#55of 61
$50 · cheaper than 5%
Claude Mythos 5.2:#53of 61
$40 · cheaper than 12%
Context window
Claude Mythos 5.1: Not listed
Claude Mythos 5.2:#28of 70
1M tokens · longer than 23%
Cost
What each costs
Example workloads at each provider's listed rates, then every other rate either one lists. The cheaper figure in each row is highlighted.
The same work, priced
For 10M input and 2M output tokens, Claude Mythos 5.1 costs 1.3 times as much as Claude Mythos 5.2, at each provider's listed rates.
10M input and 2M output tokens
Claude Mythos 5.1 costs 1.3× as much
- Claude Mythos 5.1
- $200
- Claude Mythos 5.2
- $160
The same, with 9M of the input tokens cached
Claude Mythos 5.1 costs 1.3× as much
- Claude Mythos 5.1
- $112.25
- Claude Mythos 5.2
- $89.80
| Workload or rate | Claude Mythos 5.1 | Claude Mythos 5.2 |
|---|---|---|
| Example workloads | ||
| 10M input and 2M output tokens | $200 | $160 (better) |
| The same, with 9M of the input tokens cached | $112.25 | $89.80 (better) |
| The same, through the batch API | Not listed | $80 |
| Other listed rates | ||
| 1M input tokens, cached | $0.25 | $0.20 (better) |
| 1M input tokens, 5-minute cache write | Not listed | $10 |
| 1M input tokens, 1-hour cache write | Not listed | $16 |
| 1M input tokens, batch | Not listed | $4 |
| 1M output tokens, batch | Not listed | $20 |
Your own bill will differ. These figures use list prices and example workloads. The AI Model Cost Audit reviews your real usage, shortlists models that score as well for each task for less, and estimates the savings.
Launch price $100, regular price $150
Verdict
When to choose each
Claude Mythos 5.1
Where it leads
No measured lead over Claude Mythos 5.2 in this data.
Best for
- Organisations already admitted to Anthropic’s limited-availability programme that need frontier capability at Fable 5.1 rates
Watch out for
- Limited availability: access is restricted to organisations vetted through Anthropic’s Glasswing programme, so it cannot be assumed available for a general evaluation
- Anthropic’s public model comparison table does not list a context window or maximum output for Mythos 5.1, so both are recorded as unknown here rather than inferred from Fable 5.1
- Claude Mythos 5.2 (November 9, 2026) succeeds it at a lower price, $8 input and $40 output per 1M tokens
Claude Mythos 5.2
Where it leads
- Lower input and output prices, $8 and $40 vs $10 and $50 per 1M tokens
- Cheaper cached input, $0.20 vs $0.25 per 1M tokens
- Batch pricing, $4 input and $20 output per 1M tokens
Best for
- Vetted security teams finding, reproducing and fixing vulnerabilities
- Dual-use research in security or biology that Claude Fable 5.2's safeguards block
Watch out for
- Limited access: only organisations verified through Anthropic's programs, such as the Cyber Verification Program, can call it
- No independent benchmark has scored it; every number for it comes from Anthropic
From benchmark to production
Building on Claude Mythos 5.1 or Claude Mythos 5.2?
Public scores rarely hold on your own data. We test both models on your real tasks, then build the agent or pipeline around the one that wins.
AI Model Cost AuditLaunch price $100, regular price $150What the audit includes
FAQ
Claude Mythos 5.1 vs Claude Mythos 5.2 FAQ
Which is cheaper, Claude Mythos 5.1 or Claude Mythos 5.2?
Claude Mythos 5.2 is 20% cheaper per 1M input tokens than Claude Mythos 5.1, $8 vs $10. For 10M input and 2M output tokens, Claude Mythos 5.1 costs $200 and Claude Mythos 5.2 $160 at standard rates.
Which is cheaper with prompt caching, Claude Mythos 5.1 or Claude Mythos 5.2?
Claude Mythos 5.1 charges $0.25 per 1M cached input tokens, 98% below its standard input rate, and Claude Mythos 5.2 $0.20, 98% below. With 9M of 10M input tokens cached and 2M output tokens, Claude Mythos 5.1 costs $112.25 and Claude Mythos 5.2 $89.80.
Further reading
More on Claude Mythos 5.1 and Claude Mythos 5.2
Articles on Claude Mythos 5.1 and Claude Mythos 5.2
- Claude Fable 5.2 vs Opus 5.5, GPT-6 Astra and Mythos 5.2November 10, 2026
Related comparisons
- Claude Mythos 5.1 vs GPT-6 Cyber
- Claude Fable 5.1 vs Claude Mythos 5.2
- Claude Mythos 5.1 vs GPT-Rosalind-6
- Claude Fable 5.2 vs Claude Mythos 5.2
- Claude Mythos 5.1 vs Claude Opus 5.5
- Claude Fable 5 vs Claude Mythos 5.2
- Claude Mythos 5.1 vs GPT-6 Astra
- Claude Mythos 5.2 vs Claude Opus 5.5
- Claude Fable 5.1 vs Claude Mythos 5.1
- Claude Mythos 5.2 vs Gemini 4 Carbon
- Claude Fable 5 vs Claude Mythos 5.1
- Claude Mythos 5.2 vs GPT-5.6 Cyber
Production evaluation
Choosing between Claude Mythos 5.1 and Claude Mythos 5.2?
Public benchmarks narrow the shortlist. We run both on your own tasks, data and cost limits, then build the routing and review controls to run the winner in production.
- A head-to-head evaluation on your real workload
- Routing between models by cost and difficulty