Claude Fable 5 vs Mistral Medium 3.5 128B
Wins 6 of 7 areas
Coding · Agents · Reasoning · Facts · Images and charts · Long documents
Wins 1 of 7 areas
Following instructions
Claude Fable 5 is the stronger all-rounder.Mistral Medium 3.5 128B is cheaper and better at following instructions.
Scores updated · 25 tests both models report · How we compare
Where each one wins
Tests won in each of the seven areas where both have results. Each piece is one test, so a longer bar means more evidence; grey means the two scored within a point of each other.
- CodingWriting and fixing software50Claude Fable 55 of 5 tests
- AgentsCarrying out multi-step tasks on its own40Claude Fable 54 of 4 tests
- ReasoningHard problems that need careful thinking30Claude Fable 53 of 3 tests
- FactsGetting facts right instead of making them up20Claude Fable 52 of 2 tests
- Images and chartsUnderstanding pictures, charts and video20Claude Fable 52 of 2 tests
- Long documentsFinding answers in very long texts10Claude Fable 51 of 1 test
- Following instructionsDoing exactly what it is asked01Mistral Medium 3.5 128B1 of 1 test
Long documents and following instructions rest on a single test each.
What it costs
Prices per million tokens, roughly 750,000 words. The bars show the cost of a million tokens read plus a million written.
Mistral Medium 3.5 128B costs 85% less for the same work.
The biggest differences
The tests each model wins by the widest margin, up to three each. Scores are out of 100.
Where Claude Fable 5 pulls ahead
- Real work tasks from 44 professionsGDPVal+42.4points ahead
- Very hard expert questions across many subjectsHumanity's Last Exam+41.7points ahead
- Answers hard knowledge questions correctlyAA-Omniscience · Accuracy+40.7points ahead
Where Mistral Medium 3.5 128B pulls ahead
- Follows unfamiliar, precisely checkable instructionsIFBench+5.3points ahead
Every test, side by side
All 25 tests both models report. The winning score is in its model's colour; marks a score checked independently.
CodingClaude Fable 5
- LMArena · WebDevClaude Fable 5 by 360 rating points16251265+360 rating
- Terminal-Bench 2.1Claude Fable 5 by 3484.650.6+34
- Terminal-Bench HardClaude Fable 5 by 29.662.933.3+29.6
- SciCodeClaude Fable 5 by 20.86140.2+20.8
- SWE-bench VerifiedClaude Fable 5 by 17.49577.6+17.4
AgentsClaude Fable 5
- GDPValClaude Fable 5 by 42.455.613.2+42.4
- Terminal-Bench 4.0Claude Fable 5 by 42.442.40+42.4
- BrowseCompClaude Fable 5 by 38.887.448.6+38.8
- τ-Bench V3 · BankingClaude Fable 5 by 2338.115.1+23
ReasoningClaude Fable 5
- Humanity's Last ExamClaude Fable 5 by 41.755.513.8+41.7
- CritPtClaude Fable 5 by 28.628.60+28.6
- GPQA DiamondClaude Fable 5 by 17.892.674.8+17.8
FactsClaude Fable 5
- AA-Omniscience · AccuracyClaude Fable 5 by 40.765.324.7+40.7
- AA-Omniscience · Non-hallucinationClaude Fable 5 by 1836.418.4+18
Images and chartsClaude Fable 5
- MMMU-ProClaude Fable 5 by 19.384.264.9+19.3
- LMArena · VisionClaude Fable 5 by 103 rating points13251222+103 rating
Following instructionsMistral Medium 3.5 128B
- IFBenchMistral Medium 3.5 128B by 5.363.568.8+5.3
Other results7 tests, not counted
Tests outside the eight areas. They are not counted above: several are summary scores built from other tests, or the same test under another name.
- AA-OmniscienceClaude Fable 5 by 80.143.3-36.8+80.1
- AA Agentic IndexClaude Fable 5 by 41.6519.4+41.6
- AA IntelligenceClaude Fable 5 by 35.449.614.2+35.4
- Artificial Analysis Coding IndexClaude Fable 5 by 29.676.546.9+29.6
- Finance Agent v2Claude Fable 5 by 24.256.332.1+24.2
- τ³-Bench BankingClaude Fable 5 by 13.426.813.4+13.4
- τ²-Bench Telecom (AA run)Claude Fable 5 by 4.398.594.2+4.3
Questions people ask
Which is better, Claude Fable 5 or Mistral Medium 3.5 128B?
Claude Fable 5 wins six of the seven areas where both have results: coding, agents, reasoning, facts, images and charts and long documents. Mistral Medium 3.5 128B wins following instructions, and costs 85% less.
Which is better for coding?
Claude Fable 5. It wins 5 of the 5 coding tests both models report; Mistral Medium 3.5 128B wins none.
Which is cheaper?
Claude Fable 5 costs $10.00 per million input tokens and $50.00 per million output tokens; Mistral Medium 3.5 128B costs $1.50 and $7.50. That makes Mistral Medium 3.5 128B about 85% cheaper for the same work.
How do you compare the two?
We use the 25 benchmark tests both models have published scores on. The verdict counts the 18 tests in the eight capability areas, and a gap under one point (ten on rating-style scales) counts as a tie. The other 7 are listed but not counted, because several are summary scores or repeat a test. Each score is the one shown on the model's own page.