Noometry

Model comparison

Claude Fable 5.1 vs Mistral Nemo

Claude Fable 5.1 is the stronger model overall, scoring 69.0 to 26.4 on the Noometry Index. Mistral Nemo costs 133× less per token, which makes it the better buy when Claude Fable 5.1's lead doesn't matter for your workload.

Last verified . 3 shared benchmarks.

Claude Fable 5.1 Anthropic

69.0

Rank #2 Confirmed

Mistral Nemo Mistral AI

26.4

Rank #337 Confirmed

Summary

  • They share 3 benchmarks with published results for both. Claude Fable 5.1 scores higher in 5 categories and Mistral Nemo in 0 categories; 5 gaps are clear of the uncertainty.
  • The widest gap is in math, where Claude Fable 5.1 leads 89.6 to 25.5.
  • The biggest single-benchmark swing is DTBench: 97.6% for Claude Fable 5.1 and 48.6% for Mistral Nemo.
  • Mistral Nemo is cheaper at $0.15 / $0.15 per million input/output tokens, against $10 / $50 for Claude Fable 5.1.
  • Claude Fable 5.1 accepts more context: 1M tokens versus 128K.
  • Mistral Nemo has downloadable open weights; the other is API-only.

Side by side

Claude Fable 5.1Mistral Nemo
ProviderAnthropicMistral AI
Noometry Index69.026.4
Released2026-09-012024-07-01
WeightsProprietaryOpen
Context window1M128K
Max output128K128K
Input $ / M tokens$10$0.15
Output $ / M tokens$50$0.15
Results tracked5210

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Category by category

Coding Not comparable

Claude Fable 5.1: 74.7 (#1), Mistral Nemo: —

BenchmarkClaude Fable 5.1Mistral Nemo
FrontierCode50.9%—
CursorBench51.8%—
LMArena WebDev1744—
FrontierSWE56.3%—
SciCode63.1%—
GSO88.2%—
WeirdML92.9%—
LMArena Coding1528—
MirrorCode73.3%—
ALE-Bench2,143—

Agentic & Tool Use Claude Fable 5.1 leads

Claude Fable 5.1: 50.7 (#5), Mistral Nemo: 23.5 (#125)

BenchmarkClaude Fable 5.1Mistral Nemo
APEX-Agents68.6%—
Berkeley Function Calling Leaderboard—27.6%
Remote Labor Index17.9%—
BALROG—17.6%
GDP.pdf29.6%—
Vending-Bench 25,422—

Reasoning Claude Fable 5.1 leads

Claude Fable 5.1: 76.7 (#7), Mistral Nemo: 20.7 (#232)

BenchmarkClaude Fable 5.1Mistral Nemo
DTBench97.6%48.6%
Epoch Capabilities Index164.7118.68
ARC-AGI-290%—
NYT Connections (extended)90%—
ARC-AGI-197.5%—
CritPt31.1%—
Chess Puzzles47%—
EBR-Bench57.1%—
LMArena Hard Prompts1526—
Mystery Game Puzzles58%—
LMCA65.5%—
PIQA—83.5%

Math Claude Fable 5.1 leads

Claude Fable 5.1: 89.6 (#4), Mistral Nemo: 25.5 (#268)

BenchmarkClaude Fable 5.1Mistral Nemo
FrontierMath (Tiers 1-3)90.2%—
FrontierMath Tier 487.8%—
OTIS Mock AIME 2024-2025100%—
ProofBench100%—
LMArena Math1525—
MATH Level 5—10.8%
FrontierMath Erdős0%—
GSM8K—84.2%

Knowledge Claude Fable 5.1 leads

Claude Fable 5.1: 69.6 (#6), Mistral Nemo: 12.3 (#298)

BenchmarkClaude Fable 5.1Mistral Nemo
GPQA Diamond—29.9%
Humanity's Last Exam46.5%—
SimpleQA Verified70.8%—
LMArena Expert1535—
BoolQ—82.5%

Multimodal Not comparable

Claude Fable 5.1: 53.9 (#4), Mistral Nemo: —

BenchmarkClaude Fable 5.1Mistral Nemo
LMArena Vision1318—
Blueprint-Bench 241.9%—
Furniture Assembly70%—
LMArena Document1513—

Multilingual Not comparable

Claude Fable 5.1: 59.1 (#3), Mistral Nemo: —

BenchmarkClaude Fable 5.1Mistral Nemo
LMArena Non-English1507—
LMArena Chinese1586—
LMArena French1525—
LMArena German1500—
LMArena Japanese1543—
LMArena Korean1534—
LMArena Russian1521—
LMArena Spanish1516—

Instruction Following Not comparable

Claude Fable 5.1: 79.2 (#6), Mistral Nemo: —

BenchmarkClaude Fable 5.1Mistral Nemo
LMArena Instruction Following1517—

Long Context Not comparable

Claude Fable 5.1: 46.7 (#20), Mistral Nemo: —

BenchmarkClaude Fable 5.1Mistral Nemo
LMArena Longer Query1522—

Writing & Preference Claude Fable 5.1 leads

Claude Fable 5.1: 79.2 (#2), Mistral Nemo: 28.5 (#296)

BenchmarkClaude Fable 5.1Mistral Nemo
EQ-Bench Creative Writing2162881
LMArena Text1510—
LMArena Creative Writing1507—
LMArena Multi-Turn1492—

Frequently asked questions

Is Claude Fable 5.1 better than Mistral Nemo?

Claude Fable 5.1 is the stronger model overall, scoring 69.0 to 26.4 on the Noometry Index. Mistral Nemo costs 133× less per token, which makes it the better buy when Claude Fable 5.1's lead doesn't matter for your workload.

Which is cheaper, Claude Fable 5.1 or Mistral Nemo?

Mistral Nemo is cheaper. It lists at $0.15 per million input tokens and $0.15 per million output tokens; Claude Fable 5.1 lists at $10 and $50.

Which has the bigger context window?

Claude Fable 5.1 does, with 1M tokens against 128K.

How many benchmarks do Claude Fable 5.1 and Mistral Nemo share?

3 benchmarks have published results for both models. Claude Fable 5.1 has 52 scored results on Noometry and Mistral Nemo has 10.

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