GPQA DiamondVerified
94.6%
GPQA Diamond accuracy
Models / Anthropic
Claude Mythos Preview
Claude Opus · Released 2026-06-01
Anthropic's June 2026 research preview. Also leads GPQA Diamond (94.6%), HLE (64.7%), and CharXiv (93.2%). 2M context, $75 / $300 per 1M tokens.
Research preview for the hardest reasoning, coding, and generalization tasks. Not yet in general availability — access via the Claude research program. Treat as a research artifact, not a deployment candidate.
Composite95
Context2M
Input / 1M$75
Output / 1M$300
Knowledge cutoff2026-04-01
Statusflagship
Not enough families covered yet.Add more benchmark rows for Claude Mythos Preview to see the family profile.
Editor's note
Treat Mythos as a research artifact, not a deployment candidate. The Vals 73.42% is the highest number on the public leaderboard, but the score is on a research version with frontier inference cost.Benchmark placements
Per-benchmark positions
Where Claude Mythos Preview places on each public benchmark source that publishes a row. Rank counts every model with a latest row in the same test — not a universal quality score.
| Benchmark | Family | Rank | Score | Source | Date |
|---|---|---|---|---|---|
| GPQA Diamond | Reasoning | #4/ 184 | 95 | GPQA Diamond paper leaderboard | 2026-06-02 |
Family context
Strongest rows in each family
The three highest-scoring models with pages in each capability family. Where Claude Mythos Preview shows up, it's highlighted.
ReasoningClaude Mythos Preview · 95
- 196
- 295
- 395
Math
- 152
- 252
- 350
Long context
- 189
- 286
- 385
Family coverage
Best score per family
A high composite that hides a weak family is a trap. These bars surface the families where this model hasn't been publicly tested, and where it leads.
Price vs. performance
Where Claude Mythos Preview sits on the scatter
Hover any dot for name, score, and input price. Keyboard: tab through the top twelve, or use the ranking below.
AnthropicOpenAIGoogleAlibabaMetaZhipuxAIDeepSeekMiniMaxXiaomiMoonshotOtherMeituanMistralNVIDIACohere
Full benchmark ledger
Every catalog benchmark for Claude Mythos Preview. Scores link to the original source; gaps mean no public row exists yet.
1 of 13 catalog benchmarks have a sourced row for Claude Mythos Preview.
Reasoning
Sources
Where the numbers come from
- Listed on the model atlas. Sourced scores that still have a public explainer are on the ledger.· checked 2026-06-02
- ARC Prize leaderboard· checked 2026-06-02
Questions this model page answers
Every answer below is assembled from the dated fields on this page. Nothing is written separately for search.
What is Claude Mythos Preview?
Claude Mythos Preview is a Anthropic model: Anthropic's June 2026 research preview. Also leads GPQA Diamond (94.6%), HLE (64.7%), and CharXiv (93.2%). 2M context, $75 / $300 per 1M tokens.
What is Claude Mythos Preview for?
Research preview for the hardest reasoning, coding, and generalization tasks. Not yet in general availability — access via the Claude research program. Treat as a research artifact, not a deployment candidate.
What does Claude Mythos Preview cost?
Claude Mythos Preview lists $75 input and $300 output per 1M tokens. Pricing last checked 2026-06-02.
How large is the Claude Mythos Preview context window?
Claude Mythos Preview publishes a 2M token context window.
What is the VerdictPal status of Claude Mythos Preview?
Claude Mythos Preview carries Flagship status on the model atlas.
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