Claude Fable 5.1 vs GPT-5.5 Pro
Change modelsClaude Fable 5.1Anthropic
GPT-5.5 ProOpenAI
IndexAll categories, out of 100.
76.2 ±2.4 best
74.8 ±8.7
GapIndex points below the top.
Top
−1.4 · no clear gap
CoverageIndex weight that has results.
95% best
60%
SpeedOutput tokens per second.
69/s best
19/s
EloLMArena rating and rank.
1512
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ReleasedMonth of release.
2026-09
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.
$25.00 best
$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.
71.1
71.1
CodingCode writing and repair.
77.7
—
ReasoningLogic problems and puzzles.
75.8
81.1 best
MultimodalTasks with images and text.
77.9
—
KnowledgeFacts and expert knowledge.
77.2 best
69.0
MultilingualTasks in many languages.
—
—
InstructionTasks with strict prompt rules.
74.3
—
MathMath problems.
77.0 best
76.3
Benchmarks
11 sharedOnly Claude Fable 5.1: 121Only GPT-5.5 Pro: 4
Claude Fable 5.1
GPT-5.5 Pro