Claude Mythos 5 vs GPT-5.5
Change modelsClaude Mythos 5Anthropic
GPT-5.5OpenAI
IndexAll categories, out of 100.
70.8 ±8.6 best
69.1 ±2.5
GapIndex points below the top.
Top
−1.7 · no clear gap
CoverageIndex weight that has results.
65%
95% best
SpeedOutput tokens per second.
—
52/s
EloLMArena rating and rank.
—
1466
ReleasedMonth of release.
2026-06
2026-04
Input / 1MUS dollars per 1M input tokens.
$10.00
$5.00 best
Output / 1MUS dollars per 1M output tokens.
$50.00
$30.00 best
Batch output / 1MBatch price per 1M output tokens.
—
$15.00
1K chats2K tokens in, 500 out, each.
$45.00
$25.00 best
1K documents20K tokens in, 1K out, each.
$250.00
$130.00 best
1K agent tasks200K tokens in, 20K out, each.
$3,000.00
$1,600.00 best
ContextMaximum tokens in one request.
1M
1.05M best
AgenticMulti-step tasks with tools.
70.0 best
65.8
CodingCode writing and repair.
74.4 best
65.5
ReasoningLogic problems and puzzles.
—
74.1
MultimodalTasks with images and text.
70.8 best
66.8
KnowledgeFacts and expert knowledge.
74.9 best
70.4
MultilingualTasks in many languages.
—
—
InstructionTasks with strict prompt rules.
—
64.8
MathMath problems.
—
74.7
Benchmarks
7 sharedOnly Claude Mythos 5: 5Only GPT-5.5: 105
Claude Mythos 5
GPT-5.5