AI Rate CardClaude Mythos 5.1 vs Claude Opus 5.5: API price and specs
Claude Opus 5.5 is 60% cheaper than Claude Mythos 5.1 on input price.
Claude Opus 5.5 is 60% cheaper than Claude Mythos 5.1 on output price.
Claude Opus 5.5 is 60% cheaper than Claude Mythos 5.1 on a 1M-in / 200k-out workload.
| Field | Claude Mythos 5.1 | Claude Opus 5.5 |
|---|---|---|
| Lowest input, per 1M | $5.00 +150% | $2.00 |
| Median input, per 1M | $7.50 +87.5% | $4.00 |
| Lowest output, per 1M | $25.00 +150% | $10.00 |
| Median output, per 1M | $37.50 +87.5% | $20.00 |
| Lowest unit price | — | — |
| Cost of 1M in + 200k out | $10.00 +150% | $4.00 |
| Context | 1M | 1M |
| Max output | 128K | 128K |
| Providers | 2 +93.8% | 32 |
| Regions | — | APAC, AU, EU, GLOBAL, JP, US |
| Accepts | image, text | application/pdf, file, image, image/gif, image/jpeg, image/png, image/webp, pdf, text |
| Returns | text | text |
| Type | Text models | Text models |
| Free option | no | no |
| Cheapest provider | iteracompute | iteracompute |
Your own workload: how many tokens the model gets (input) and gives back (output) - for example, in a month. The "Cost" row of the table above is recalculated for these numbers, for each model.
Computed from current offers each time the page opens; the best value of a row is bold, the percent is how far behind the best.
Providers selling both
Frequently asked questions
Which is cheaper, Claude Mythos 5.1 or Claude Opus 5.5?
Claude Opus 5.5 is 60% cheaper than Claude Mythos 5.1 on input price. Claude Opus 5.5 is 60% cheaper than Claude Mythos 5.1 on output price. Claude Opus 5.5 is 60% cheaper than Claude Mythos 5.1 on a 1M-in / 200k-out workload.
Which has the larger context, Claude Mythos 5.1 or Claude Opus 5.5?
Claude Mythos 5.1: 1M tokens; Claude Opus 5.5: 1M tokens.
Where can I use both Claude Mythos 5.1 and Claude Opus 5.5?
anthropic, iteracompute