Claude Mythos 5
Pricing & Specs
Anthropic · $10 input / $50 output per 1M tokens · 1M context window
No longer offered on OpenMark
Claude Mythos 5 is no longer offered on OpenMark (deprecated or superseded upstream). Its specs are kept here for reference — if you're still running it in production, it's worth benchmarking current alternatives: newer models are often cheaper AND better on the same task.
Claude Mythos 5 API Pricing
| Tokens | Price |
|---|---|
| Input | $10 / 1M tokens |
| Output | $50 / 1M tokens |
| Cached input | $1 / 1M tokens |
50% discount available for batch API requests. Cache writes: $12.50/MTok (5min), $20/MTok (1hr). Cache hits & refreshes: $1/MTok.
What that means in practice
Claude Mythos 5 Specs
| Spec | Value |
|---|---|
| Context window | 1M tokens |
| Max output tokens | 128K tokens |
| Input modalities | text, image |
| Output modalities | text |
| Reasoning model | Yes |
| Tool / function calling | Yes |
| JSON mode | Yes |
| Streaming | Yes |
| Prompt caching | Yes |
| Batch API | Yes |
Notes
Limited availability (Project Glasswing). Same capabilities as Fable 5 without safety classifiers. Adaptive thinking always on. Raw thinking content is never returned.
FAQ
How much does Claude Mythos 5 cost?
Claude Mythos 5 costs $10 per 1M input tokens and $50 per 1M output tokens ($1 per 1M cached input tokens).
What is Claude Mythos 5's context window?
Claude Mythos 5 has a 1M-token context window. Maximum output is 128K tokens.
Can I test Claude Mythos 5 on my own task?
Claude Mythos 5 is no longer offered on OpenMark, but you can benchmark its current alternatives from Anthropic and other providers on your own task — free tier available.
Still using Claude Mythos 5?
It's been superseded. Benchmark its current alternatives on your actual
workload — you'll likely find something cheaper AND better. Free tier available.