Claude Fable 5.1 vs Claude Mythos 5
Change modelsClaude Fable 5.1Anthropic
Claude Mythos 5Anthropic
IndexAll categories, out of 100.
76.2 ±2.4 best
70.8 ±8.6
GapIndex points below the top.
Top
−5.4 · no clear gap
CoverageIndex weight that has results.
95% best
65%
SpeedOutput tokens per second.
69/s
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EloLMArena rating and rank.
1512
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ReleasedMonth of release.
2026-09
2026-06
Input / 1MUS dollars per 1M input tokens.
$10.00
$10.00
Output / 1MUS dollars per 1M output tokens.
$50.00
$50.00
Batch output / 1MBatch price per 1M output tokens.
$25.00
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1K chats2K tokens in, 500 out, each.
$45.00
$45.00
1K documents20K tokens in, 1K out, each.
$250.00
$250.00
1K agent tasks200K tokens in, 20K out, each.
$3,000.00
$3,000.00
ContextMaximum tokens in one request.
1M
1M
AgenticMulti-step tasks with tools.
71.1 best
70.0
CodingCode writing and repair.
77.7 best
74.4
ReasoningLogic problems and puzzles.
75.8
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MultimodalTasks with images and text.
77.9 best
70.8
KnowledgeFacts and expert knowledge.
77.2 best
74.9
MultilingualTasks in many languages.
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InstructionTasks with strict prompt rules.
74.3
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MathMath problems.
77.0
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Benchmarks
3 sharedOnly Claude Fable 5.1: 129Only Claude Mythos 5: 9
Claude Fable 5.1
Claude Mythos 5