Claude Fable 5.1 vs GPT-5.5
Change modelsClaude Fable 5.1Anthropic
GPT-5.5OpenAI
IndexAll categories, out of 100.
76.2 ±2.4 best
69.1 ±2.5
GapIndex points below the top.
Top
−7.1
CoverageIndex weight that has results.
95%
95%
SpeedOutput tokens per second.
69/s best
52/s
EloLMArena rating and rank.
1512 best
1466
ReleasedMonth of release.
2026-09
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.
$25.00
$15.00 best
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.
71.1 best
65.8
CodingCode writing and repair.
77.7 best
65.5
ReasoningLogic problems and puzzles.
75.8 best
74.1
MultimodalTasks with images and text.
77.9 best
66.8
KnowledgeFacts and expert knowledge.
77.2 best
70.4
MultilingualTasks in many languages.
—
—
InstructionTasks with strict prompt rules.
74.3 best
64.8
MathMath problems.
77.0 best
74.7
Benchmarks
70 sharedOnly Claude Fable 5.1: 62Only GPT-5.5: 42
Claude Fable 5.1
GPT-5.5