Claude Mythos 5 vs GPT-5.5 Pro
Change modelsClaude Mythos 5Anthropic
GPT-5.5 ProOpenAI
IndexAll categories, out of 100.
70.8 ±8.6
74.8 ±8.7 best
GapIndex points below the top.
−4.0 · no clear gap
Top
CoverageIndex weight that has results.
65% best
60%
SpeedOutput tokens per second.
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19/s
EloLMArena rating and rank.
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ReleasedMonth of release.
2026-06
2026-04
Input / 1MUS dollars per 1M input tokens.
$10.00 best
$30.00
Output / 1MUS dollars per 1M output tokens.
$50.00 best
$180.00
Batch output / 1MBatch price per 1M output tokens.
—
$90.00
1K chats2K tokens in, 500 out, each.
$45.00 best
$150.00
1K documents20K tokens in, 1K out, each.
$250.00 best
$780.00
1K agent tasks200K tokens in, 20K out, each.
$3,000.00 best
$9,600.00
ContextMaximum tokens in one request.
1M
1.05M best
AgenticMulti-step tasks with tools.
70.0
71.1 best
CodingCode writing and repair.
74.4
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ReasoningLogic problems and puzzles.
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81.1
MultimodalTasks with images and text.
70.8
—
KnowledgeFacts and expert knowledge.
74.9 best
69.0
MultilingualTasks in many languages.
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—
InstructionTasks with strict prompt rules.
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—
MathMath problems.
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76.3
Benchmarks
3 sharedOnly Claude Mythos 5: 9Only GPT-5.5 Pro: 12
Claude Mythos 5
GPT-5.5 Pro