tokevenClaude Mythos 5.1
Claude Mythos 5.1 is Claude's most capable model, priced at $10.00/MTok input and $50.00/MTok output with a 1,000K context window. Backfilled on 2026-09-23. Prices confirmed by the provider pricing page and the LiteLLM cross-check. Release date not published in a machine-readable source. Not yet benchmarked, so never recommended.
Input $/MTok
$10.00
Output $/MTok
$50.00
Context window
1,000K
Cache read discount
98% off
Claude Mythos 5.1 pricing breakdown
| Rate | Input $/MTok | Output $/MTok |
|---|---|---|
| Standard | $10.00 | $50.00 |
| Cached read (98% off input) | $0.25 | - |
| Cached write (25% surcharge) | $12.50 | - |
| Batch (50% off) | $5.00 | $25.00 |
All rates in USD per million tokens. Prices verified against provider documentation.
Claude Mythos 5.1 task benchmarks
Confidence scores (0-100) and cross-provider rank for each task type. Rank 1 is best across all 72 models.
Not benchmarked. The third-party benchmark source used for confidence scores does not cover Claude models yet. Scores will appear here once independent benchmarks are published.
Claude Mythos 5.1 cost by use case
Estimated cost per API call using default token counts for each workload.
| Use case | Input tokens | Output tokens | Cost / call |
|---|---|---|---|
| Code Generation | 2,000 | 4,000 | $0.2200 |
| Unit Test Generation | 3,000 | 5,000 | $0.2800 |
| SQL Generation | 1,500 | 1,000 | $0.0650 |
| API Generation | 3,000 | 6,000 | $0.3300 |
| Code Refactoring | 4,000 | 4,000 | $0.2400 |
| Code Review | 5,000 | 2,000 | $0.1500 |
| PR Review | 8,000 | 3,000 | $0.2300 |
| Security Review | 6,000 | 2,500 | $0.1850 |
| Bug Detection | 5,000 | 2,000 | $0.1500 |
| Document Summarization | 10,000 | 1,000 | $0.1500 |
| PDF Summarization | 15,000 | 1,500 | $0.2250 |
| Meeting Notes | 8,000 | 2,000 | $0.1800 |
Monthly cost projections
Projected monthly spend at different call volumes, using code generation as a representative workload (2,000 input / 4,000 output tokens per call).
| Calls / month | Without caching | With caching (98% read discount) |
|---|---|---|
| 1K | $220 | $206.35 |
| 10K | $2,200 | $2,063.5 |
| 100K | $22,000 | $20,635 |
| 500K | $110,000 | $103,175 |
| 1M | $220,000 | $206,350 |
Caching estimate assumes 70% of input tokens are cache reads. Your actual cache hit rate will depend on prompt structure and reuse.
Flagship alternatives to Claude Mythos 5.1
Same-tier models from other providers, sorted by input price.
| Model | Provider | Input $/MTok | Output $/MTok | Input savings |
|---|---|---|---|---|
| GPT 6 Sol | GPT | $2.00 | $10.00 | 80% cheaper |
| Grok 4.6 | Grok | $2.00 | $6.00 | 80% cheaper |
| Grok 4.5 | Grok | $2.00 | $6.00 | 80% cheaper |
| Grok 4.7 | Grok | $2.00 | $6.00 | 80% cheaper |
| GPT 5.6 Sol | GPT | $4.00 | $20.00 | 60% cheaper |
| GPT 5.5 | GPT | $5.00 | $30.00 | 50% cheaper |
| GPT 4o (2024-05-13) | GPT | $5.00 | $15.00 | 50% cheaper |
| GPT 4 Turbo (2024-04-09) | GPT | $10.00 | $30.00 | Same price |
| GPT 6 Astra | GPT | $10.00 | $50.00 | Same price |
| GPT 5 Pro | GPT | $15.00 | $120.00 | 50% more |
| o1 | GPT | $15.00 | $60.00 | 50% more |
| o3 Pro | GPT | $20.00 | $80.00 | 100% more |
| GPT 5.2 Pro | GPT | $21.00 | $168.00 | 110% more |
| GPT 4 (0613) | GPT | $30.00 | $60.00 | 200% more |
| GPT 5.4 Pro | GPT | $30.00 | $180.00 | 200% more |
| GPT 5.5 Pro | GPT | $30.00 | $180.00 | 200% more |
| o1 Pro | GPT | $150.00 | $600.00 | 1400% more |
Other Claude models
Claude Haiku 4.5
Fast / Budget / $1.00 in / $5.00 out
Claude Sonnet 5
Mid-tier / $2.00 in / $10.00 out
Claude Sonnet 4.6
Mid-tier / $3.00 in / $15.00 out
Claude Opus 5.5
Flagship / $4.00 in / $20.00 out
Claude Opus 4.8
Flagship / $5.00 in / $25.00 out
Claude Opus 5
Flagship / $5.00 in / $25.00 out
Claude Opus 4.7
Flagship / $5.00 in / $25.00 out
Claude Opus 4.6
Flagship / $5.00 in / $25.00 out
Claude Opus 4.5
Flagship / $5.00 in / $25.00 out
Claude Fable 5.1
Flagship / $10.00 in / $50.00 out
Claude Fable 5
Flagship / $10.00 in / $50.00 out
Claude Mythos 5
Flagship / $10.00 in / $50.00 out
Track your Claude Mythos 5.1 spend
See exactly how much you spend on Claude Mythos 5.1 and where you can save. Two-line wrapper install, no API keys shared.