DEPRECATED
Retired 2026-06-09 — 113 days ago. Requests to this identifier are expected to fail.
state=dead sunset=2026-06-09 days_remaining=-113 severity=critical sources=docs,litellm evidence_tier=documentation confirmed_by_endpoint=false documented_by_provider=docs replacement=none corroborated=yes divergent_fields=none checked=2026-09-30 15:40Z
anthropic/claude-mythos-preview
Vendor: anthropic. Tracked by 2 of 5 sources.
What each source reports
| Source | ID | Context | Max out | In $/Mtok | Out $/Mtok | Sunset |
|---|---|---|---|---|---|---|
| docs | claude-mythos-preview | — | — | — | — | 2026-06-09 |
| litellm | claude-mythos-preview | 1,000,000 | 128,000 | $10 | $50 | 2026-06-09 |
Change history
| Severity | Change | What | Detected |
|---|---|---|---|
| medium | repriced | anthropic.claude-mythos-preview: input_price_per_mtok $0.0000/Mtok to $27.50/Mtok | 2026-09-26 |
| medium | repriced | anthropic.claude-mythos-preview: output_price_per_mtok $0.0000/Mtok to $137.50/Mtok | 2026-09-26 |
| low | modified | anthropic.claude-mythos-preview: capabilities gained prompt_caching | 2026-09-26 |
| info | repriced | anthropic.claude-mythos-preview: cache_read_price_per_mtok n/a to $2.75/Mtok | 2026-09-26 |
| low | added | new model apac.anthropic.claude-mythos-preview (1,000,000 ctx) | 2026-09-24 |
| low | added | new model au.anthropic.claude-mythos-preview (1,000,000 ctx) | 2026-09-24 |
| low | added | new model us.anthropic.claude-mythos-preview (1,000,000 ctx) | 2026-09-24 |
| info | deprecated | claude-mythos-preview: deprecation announced for 2026-06-09 (date already passed) | 2026-09-24 |
| low | modified | claude-mythos-preview: capabilities gained anthropic_compaction | 2026-09-22 |
| low | added | new model claude-mythos-preview | 2026-09-18 |
| info | deprecated | claude-mythos-preview: retires 2026-06-09 (101 days ago) | 2026-09-18 |
| low | modified | claude-mythos-preview: capabilities gained native_structured_output | 2026-08-21 |
| low | added | new model claude-mythos-preview (1,000,000 ctx) | 2026-08-12 |
| info | modified | [source artifact — 9 providers changed identically on the same day] anthropic.claude-mythos-preview: capabilities lost minimal_reasoning_effort; gained output_config | 2026-05-29 |