Anthropic
Claude Mythos 5.1 token cost
Invitation-only Claude Mythos 5.1: same model and $10/$50 pricing as Fable 5.1, offered through Project Glasswing.
Published list rates
Input
$10.00
per 1M tokens
Output
$50.00
per 1M tokens
Cached input
$0.25
per 1M tokens
Context window
1,000,000
tokens
Pricing source: Anthropic Claude pricing
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Project monthly volume
Daily requests × tokens per request × 30 days.
Estimated cost
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Cost as volume grows
Claude Mythos 5.1 at rising volume: prompt-only, reply-only, and a mixed chat (70% in, 30% out).
| Tokens | Input only | Output only | Mix (70% in / 30% out) |
|---|---|---|---|
| 1 | $0.00001 | $0.00005 | $0.000022 |
| 10 | $0.0001 | $0.0005 | $0.00022 |
| 100 | $0.001 | $0.005 | $0.0022 |
| 200 | $0.002 | $0.01 | $0.0044 |
| 300 | $0.003 | $0.015 | $0.0066 |
| 400 | $0.004 | $0.02 | $0.0088 |
| 500 | $0.005 | $0.025 | $0.011 |
| 1,000 | $0.01 | $0.05 | $0.022 |
| 2,000 | $0.02 | $0.1 | $0.044 |
| 5,000 | $0.05 | $0.25 | $0.11 |
| 10,000 | $0.1 | $0.5 | $0.22 |
| 25,000 | $0.25 | $1.25 | $0.55 |
| 50,000 | $0.5 | $2.50 | $1.10 |
| 100,000 | $1.00 | $5.00 | $2.20 |
| 250,000 | $2.50 | $12.50 | $5.50 |
| 500,000 | $5.00 | $25.00 | $11.00 |
| 1,000,000 | $10.00 | $50.00 | $22.00 |
| 5,000,000 | $50.00 | $250.00 | $110.00 |
| 10,000,000 | $100.00 | $500.00 | $220.00 |
| 50,000,000 | $500.00 | $2,500.00 | $1,100.00 |
| 100,000,000 | $1,000.00 | $5,000.00 | $2,200.00 |
| 500,000,000 | $5,000.00 | $25,000.00 | $11,000.00 |
| 1,000,000,000 | $10,000.00 | $50,000.00 | $22,000.00 |
| 10,000,000,000 | $100,000.00 | $500,000.00 | $220,000.00 |
| 100,000,000,000 | $1,000,000.00 | $5,000,000.00 | $2,200,000.00 |
Tokens for a fixed budget
Tokens Claude Mythos 5.1 can process for a set budget — send-only, reply-only, and a 70/30 mix.
| Budget | Input tokens | Output tokens | Mixed tokens (70/30) |
|---|---|---|---|
| $0.01 | 1,000 | 200 | 455 |
| $0.1 | 10,000 | 2,000 | 4,545 |
| $0.5 | 50,000 | 10,000 | 22,727 |
| $1.00 | 100,000 | 20,000 | 45,455 |
| $5.00 | 500,000 | 100,000 | 227,273 |
| $10.00 | 1M | 200,000 | 454,545 |
| $20.00 | 2M | 400,000 | 909,091 |
| $25.00 | 2.5M | 500,000 | 1.14M |
| $30.00 | 3M | 600,000 | 1.36M |
| $50.00 | 5M | 1M | 2.27M |
| $100.00 | 10M | 2M | 4.55M |
| $250.00 | 25M | 5M | 11.4M |
| $500.00 | 50M | 10M | 22.7M |
| $1,000.00 | 100M | 20M | 45.5M |
| $5,000.00 | 500M | 100M | 227.3M |
| $10,000.00 | 1B | 200M | 454.5M |
At these rates
- A workload with 70% input and 30% output costs $22.00 per 1 million total tokens and $2,200.00 per 100 million.
- At the same token count, output costs 5 times the input rate. Response length therefore deserves its own budget limit.
- Filling the 1,000,000-token context window with input alone would cost about $10.00, before any output.
- Cached input is $0.25 per million, 98% below standard input when the workload meets the provider’s cache rules.
Invite only (Project Glasswing), released September 1, 2026. 1M context, 128K max output, adaptive thinking always on. Cache reads are $0.25 per 1M; batch is 50% off.
These figures use public list prices. Cache eligibility, batch or priority modes, long-context surcharges, discounts, and regional billing can change the invoice.