Claude Fable 5.1 vs Claude Opus 5.5
Change modelsClaude Fable 5.1Anthropic
Claude Opus 5.5Anthropic
IndexAll categories, out of 100.
76.2 ±2.4
78.6 ±2.4 best
GapIndex points below the top.
−2.4 · no clear gap
Top
CoverageIndex weight that has results.
95%
95%
SpeedOutput tokens per second.
69/s
76/s best
EloLMArena rating and rank.
1512
1513 best
ReleasedMonth of release.
2026-09
2026-09
Input / 1MUS dollars per 1M input tokens.
$10.00
$4.00 best
Output / 1MUS dollars per 1M output tokens.
$50.00
$20.00 best
Batch output / 1MBatch price per 1M output tokens.
$25.00
$10.00 best
1K chats2K tokens in, 500 out, each.
$45.00
$18.00 best
1K documents20K tokens in, 1K out, each.
$250.00
$100.00 best
1K agent tasks200K tokens in, 20K out, each.
$3,000.00
$1,200.00 best
ContextMaximum tokens in one request.
1M
1M
AgenticMulti-step tasks with tools.
71.1
74.1 best
CodingCode writing and repair.
77.7
81.8 best
ReasoningLogic problems and puzzles.
75.8
80.8 best
MultimodalTasks with images and text.
77.9 best
74.1
KnowledgeFacts and expert knowledge.
77.2
79.2 best
MultilingualTasks in many languages.
—
—
InstructionTasks with strict prompt rules.
74.3 best
59.6
MathMath problems.
77.0
77.7 best
Benchmarks
116 sharedOnly Claude Fable 5.1: 16Only Claude Opus 5.5: 41
Claude Fable 5.1
Claude Opus 5.5