text model comparison
Claude Fable 5.2 vs Claude Mythos 5.1
Claude Fable 5.2 and Claude Mythos 5.1 are both current text models, from Anthropic. Claude Fable 5.2 is 20% cheaper per 1M input tokens than Claude Mythos 5.1, $8 vs $10.
- Lower price per 1M input tokens
- Claude Fable 5.2$8 against $10
- Newer release
- Claude Fable 5.2Nov 2026 against Sep 2026
Data verified November 11, 2026 · Dataset 2026-11-11
Side by side
Claude Fable 5.2 and Claude Mythos 5.1, 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 Fable 5.2 | Claude Mythos 5.1 |
|---|---|---|
| Price | ||
| Price per 1M input tokens | $8 (better) | $10 |
| Price per 1M output tokens | $40 (better) | $50 |
| Independent benchmarks | ||
| Arena WebDev | 1836 Elo (#1 of 44) | Not measured |
| GPQA Diamond | 93.9% (#13 of 40) | Not measured |
| FrontierMath Tiers 1-3 (v2) | 95.1% (#1 of 39) | Not measured |
| SimpleQA Verified | 94% (#1 of 36) | Not measured |
| Specs | ||
| Provider | Anthropic | Anthropic |
| Release date | November 9, 2026 | September 1, 2026 |
| Access | API only | API only |
| Context window | 1,000,000 tokens | Not reported |
| Max output | 128,000 tokens | Not reported |
| Input | text, image | text, image |
| Output | text | text |
No independent benchmark has scored both models yet. Each rank counts the current models scored on that benchmark.
Charts
Against every current text model
Where Claude Fable 5.2 and Claude Mythos 5.1 land among the current models of their task, on every independent benchmark, on price and on context.
Where each stands
Only Claude Fable 5.2 has a current Arena WebDev score: #1 of 44. Each bar is the share of current models it beats.
Independent benchmarks
Arena WebDev
Claude Fable 5.2:#1of 44
1,836 Elo · ahead of 100%
Claude Mythos 5.1: Not scored
GPQA Diamond
Claude Fable 5.2:#13of 40
93.9% · ahead of 69%
Claude Mythos 5.1: Not scored
FrontierMath Tiers 1-3 (v2)
Claude Fable 5.2:#1of 39
95.1% · ahead of 100%
Claude Mythos 5.1: Not scored
SimpleQA Verified
Claude Fable 5.2:#1of 36
94% · ahead of 100%
Claude Mythos 5.1: Not scored
Price and context
Price per 1M input tokens
Claude Fable 5.2:#51of 57
$8 · cheaper than 9%
Claude Mythos 5.1:#53of 57
$10 · cheaper than 5%
Price per 1M output tokens
Claude Fable 5.2:#51of 57
$40 · cheaper than 9%
Claude Mythos 5.1:#53of 57
$50 · cheaper than 5%
Context window
Claude Fable 5.2:#29of 67
1M tokens · longer than 24%
Claude Mythos 5.1: Not listed
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 Fable 5.2, at each provider's listed rates.
10M input and 2M output tokens
Claude Mythos 5.1 costs 1.3× as much
- Claude Fable 5.2
- $160
- Claude Mythos 5.1
- $200
The same, with 9M of the input tokens cached
Claude Mythos 5.1 costs 1.3× as much
- Claude Fable 5.2
- $89.80
- Claude Mythos 5.1
- $112.25
| Workload or rate | Claude Fable 5.2 | Claude Mythos 5.1 |
|---|---|---|
| Example workloads | ||
| 10M input and 2M output tokens | $160 (better) | $200 |
| The same, with 9M of the input tokens cached | $89.80 (better) | $112.25 |
| The same, through the batch API | $80 | Not listed |
| Other listed rates | ||
| 1M input tokens, cached | $0.20 (better) | $0.25 |
| 1M input tokens, 5-minute cache write | $10 | Not listed |
| 1M input tokens, 1-hour cache write | $16 | Not listed |
| 1M input tokens, batch | $4 | Not listed |
| 1M output tokens, batch | $20 | Not listed |
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 Fable 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
- The hardest open-ended coding, research and agent runs, where Claude Opus 5.5 at high effort falls short
- Advising or orchestrating cheaper Claude models in a multi-agent setup
Watch out for
- Gemini 4 Carbon scores higher on AutomationBench in Anthropic's own table (53.9% against 51.4%)
- Safety classifiers block most penetration testing, exploit development and research biology requests and answer them with an older model (Claude Opus 4.8 for cybersecurity, Claude Opus 5 for biology); vetted organisations use Claude Mythos 5.2 for that work
- Anthropic recommends starting most coding and knowledge work on Claude Opus 5.5, at half the price, and moving up to Fable only when it falls short; Arena Text has not rated Fable 5.2 yet, and its WebDev rating rests on 994 votes so far
Claude Mythos 5.1
Where it leads
No measured lead over Claude Fable 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
From benchmark to production
Building on Claude Fable 5.2 or Claude Mythos 5.1?
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 Fable 5.2 vs Claude Mythos 5.1 FAQ
Which is cheaper, Claude Fable 5.2 or Claude Mythos 5.1?
Claude Fable 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 Fable 5.2 costs $160 and Claude Mythos 5.1 $200 at standard rates.
Which is cheaper with prompt caching, Claude Fable 5.2 or Claude Mythos 5.1?
Claude Fable 5.2 charges $0.20 per 1M cached input tokens, 98% below its standard input rate, and Claude Mythos 5.1 $0.25, 98% below. With 9M of 10M input tokens cached and 2M output tokens, Claude Fable 5.2 costs $89.80 and Claude Mythos 5.1 $112.25.
Further reading
More on Claude Fable 5.2 and Claude Mythos 5.1
Articles on Claude Fable 5.2 and Claude Mythos 5.1
- Claude Fable 5.2 vs Opus 5.5, GPT-6 Astra and Mythos 5.2November 10, 2026
Related comparisons
- Claude Fable 5.2 vs Claude Opus 4.8
- Claude Mythos 5.1 vs Claude Mythos 5.2
- Claude Fable 5.2 vs Claude Opus 5.5
- Claude Mythos 5.1 vs GPT-6 Cyber
- Claude Fable 5.2 vs Gemini 3.8 Flash
- Claude Mythos 5.1 vs GPT-Rosalind-6
- Claude Fable 5.2 vs Gemini 4 Carbon
- Claude Mythos 5.1 vs Claude Opus 5.5
- Claude Fable 5.2 vs GPT-6 Astra
- Claude Mythos 5.1 vs GPT-6 Astra
- Claude Fable 5 vs Claude Fable 5.2
- Claude Fable 5.1 vs Claude Mythos 5.1
Production evaluation
Choosing between Claude Fable 5.2 and Claude Mythos 5.1?
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