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Claude Haiku 4.5 vs Mistral Medium 3

Claude Haiku 4.5 leads Mistral Medium 3 on the Artificial Analysis Intelligence Index, 16.9 to 9.0, and Mistral Medium 3 costs 2.5x less per output token ($2.00 vs $5.00 per million). Updated October 21, 2026; 37 benchmarks have a result for both.

Replace Claude Haiku 4.5 Replace Mistral Medium 3
Claude Haiku 4.5Anthropic
Coding
35.6
Overall
41.0
Output $/M
$5.00
34
Mistral Medium 3Mistral AI
Coding
No data
Overall
No data
Output $/M
$2.00
3
vs boards won of 37 shared

Claude Haiku 4.5 or Mistral Medium 3: which to pick

Only Claude Haiku 4.5 has a coding score, 35.6 on the Vibe Coding Index; Mistral Medium 3 has none, so the two cannot be ranked on coding.

Pick Mistral Medium 3 for output tokens 2.5x cheaper ($2.00 vs $5.00 per million) and work measured by Design Arena: 3D or LMArena Text: German, where it leads.

Model AClaude Haiku 4.5Anthropic35.6/1004 independent benchmarks$0.56 per solved taskModel BMistral Medium 3Mistral AINot benchmarkedNo coding benchmarkNo cost per solved task
Shared results
37
Claude Haiku 4.5 only
58
Mistral Medium 3 only
20
Like-for-like categories
7 of 9

Only benchmarks that tested both models count toward a pick; a result only one model has is shown but not compared.

Which one for your work

Each card is decided by one number both models carry. Where only one has it, the card says so and makes no call.

At a glance

Coding index
Claude Haiku 4.5 35.6 from 4 benchmarks, Mistral Medium 3 not benchmarked.
Widest category
Reasoning, 12.1 points apart on average over 3 shared benchmarks.
Widest single gap
LMArena Text: expert: Claude Haiku 4.5 1443 against Mistral Medium 3 1342, 16.9 points apart on a 0 to 100 scale.
Output price
Claude Haiku 4.5 $5.00 against Mistral Medium 3 $2.00 per million output tokens, 2.5x apart.
Context window
Claude Haiku 4.5 takes 200K tokens, Mistral Medium 3 131K.

Benchmark by benchmark

First the score: boards each model leads, per category, where both have a result. Then every board, a category to a fold; bars are each result on a 0 to 100 scale, so compare the two in a row, not one row with another.

Boards won, where both have a result
CategoryClaude Haiku 4.5BarsMistral Medium 3Ties
Coding20
Intelligence20
Reasoning30
Math20
Knowledge40
Web design51
General162
All shared boards343
CodingLike-for-likeSix of these boards feed the Vibe Coding Index20
Coding benchmarks for Claude Haiku 4.5 and Mistral Medium 3
BenchmarkClaude Haiku 4.5Mistral Medium 3Leader
SWE-bench Verified66.6%Not measuredOnly Claude Haiku 4.5 measured
SWE-bench Multilingual64.7%Not measuredOnly Claude Haiku 4.5 measured
LiveBench coding48.1%Not measuredOnly Claude Haiku 4.5 measured
LMArena WebDev1330Not measuredOnly Claude Haiku 4.5 measured
AA Coding Index43.9Not measuredOnly Claude Haiku 4.5 measured
LiveCodeBench (Vals AI)41.2%Not measuredOnly Claude Haiku 4.5 measured
SWE-bench Verified (Vals AI)66.6%Not measuredOnly Claude Haiku 4.5 measured
Vibe Code Bench (Vals AI)11.4%Not measuredOnly Claude Haiku 4.5 measured
Code migration (Vals AI)7.5%Not measuredOnly Claude Haiku 4.5 measured
ProgramBench (Vals AI)0.0%Not measuredOnly Claude Haiku 4.5 measured
Terminal-Bench 2.1 (Vals AI)43.8%Not measuredOnly Claude Haiku 4.5 measured
LiveCodeBench (Artificial Analysis run)Not measured40.0%Only Mistral Medium 3 measured
Terminal-Bench Hard (Artificial Analysis run)Not measured3.8%Only Mistral Medium 3 measured
Terminal-Bench35.5%Not measuredOnly Claude Haiku 4.5 measured
WeirdML45.4%Not measuredOnly Claude Haiku 4.5 measured
LMArena Text: coding14541385Claude Haiku 4.5
LMArena Text: software and IT14391385Claude Haiku 4.5
LMArena WebDev: React1326Not measuredOnly Claude Haiku 4.5 measured
LMArena WebDev: HTML1318Not measuredOnly Claude Haiku 4.5 measured
Neither model has a result on the other 20 boards here
IntelligenceLike-for-likePublic boards, shown as published, kept out of the index20
Intelligence benchmarks for Claude Haiku 4.5 and Mistral Medium 3
BenchmarkClaude Haiku 4.5Mistral Medium 3Leader
AA Intelligence Index16.99.0Claude Haiku 4.5
Epoch Capabilities Index142.2134.0Claude Haiku 4.5
Agentic workDirectional onlyPublic boards, shown as published, kept out of the index13 boards, none shared
Agentic work benchmarks for Claude Haiku 4.5 and Mistral Medium 3
BenchmarkClaude Haiku 4.5Mistral Medium 3Leader
AA Agentic Index8.0Not measuredOnly Claude Haiku 4.5 measured
LiveBench research42.2%Not measuredOnly Claude Haiku 4.5 measured
LiveBench browser40.0%Not measuredOnly Claude Haiku 4.5 measured
LiveBench long agentic11.1%Not measuredOnly Claude Haiku 4.5 measured
Finance Agent (Vals AI)31.0%Not measuredOnly Claude Haiku 4.5 measured
Tax Agent Bench (Vals AI)5.9%Not measuredOnly Claude Haiku 4.5 measured
Legal Research Bench (Vals AI)10.6%Not measuredOnly Claude Haiku 4.5 measured
Excel Modeling Benchmark (Vals AI)22.7%Not measuredOnly Claude Haiku 4.5 measured
τ²-Bench TelecomNot measured24.3%Only Mistral Medium 3 measured
BALROG31.2%Not measuredOnly Claude Haiku 4.5 measured
DeepResearch Bench45.5%Not measuredOnly Claude Haiku 4.5 measured
Vending-Bench 2$459Not measuredOnly Claude Haiku 4.5 measured
Berkeley Function Calling Leaderboard (BFCL)68.7%Not measuredOnly Claude Haiku 4.5 measured
Neither model has a result on the other 28 boards here
ReasoningLike-for-likePublic boards, shown as published, kept out of the index30
Reasoning benchmarks for Claude Haiku 4.5 and Mistral Medium 3
BenchmarkClaude Haiku 4.5Mistral Medium 3Leader
GPQA Diamond72.2%Not measuredOnly Claude Haiku 4.5 measured
LiveBench reasoning61.7%Not measuredOnly Claude Haiku 4.5 measured
MMMU Pro (Vals AI)46.1%Not measuredOnly Claude Haiku 4.5 measured
GPQA Diamond (Artificial Analysis run)Not measured57.8%Only Mistral Medium 3 measured
Humanity's Last Exam (Artificial Analysis run)Not measured4.1%Only Mistral Medium 3 measured
GPQA Diamond (Epoch AI run)71.2%Not measuredOnly Claude Haiku 4.5 measured
ARC-AGI47.7%Not measuredOnly Claude Haiku 4.5 measured
ARC-AGI-24.0%Not measuredOnly Claude Haiku 4.5 measured
Chess puzzles8.0%Not measuredOnly Claude Haiku 4.5 measured
LMArena Text: hard prompts14211364Claude Haiku 4.5
LMArena Text: expert14431342Claude Haiku 4.5
LMArena Text: hard prompts in English14351374Claude Haiku 4.5
LMArena Vision: diagramsNot measured1155Only Mistral Medium 3 measured
LMArena Vision: homeworkNot measured1165Only Mistral Medium 3 measured
Neither model has a result on the other 8 boards here
MathLike-for-likePublic boards, shown as published, kept out of the index20
Math benchmarks for Claude Haiku 4.5 and Mistral Medium 3
BenchmarkClaude Haiku 4.5Mistral Medium 3Leader
AIME82.7%Not measuredOnly Claude Haiku 4.5 measured
MGSM (Vals AI)92.2%Not measuredOnly Claude Haiku 4.5 measured
AA Math IndexNot measured30.3Only Mistral Medium 3 measured
AIME 2025 (Artificial Analysis run)Not measured30.3%Only Mistral Medium 3 measured
OTIS Mock AIME66.7%Not measuredOnly Claude Haiku 4.5 measured
MATH level 596.4%Not measuredOnly Claude Haiku 4.5 measured
LMArena Text: math13981353Claude Haiku 4.5
LMArena Text: mathematical work14301354Claude Haiku 4.5
Neither model has a result on the other 5 boards here
KnowledgeLike-for-likePublic boards, shown as published, kept out of the index40
Knowledge benchmarks for Claude Haiku 4.5 and Mistral Medium 3
BenchmarkClaude Haiku 4.5Mistral Medium 3Leader
MMLU Pro78.7%Not measuredOnly Claude Haiku 4.5 measured
LegalBench (Vals AI)81.2%Not measuredOnly Claude Haiku 4.5 measured
CaseLaw (Vals AI)56.5%Not measuredOnly Claude Haiku 4.5 measured
CorpFin (Vals AI)60.6%Not measuredOnly Claude Haiku 4.5 measured
TaxEval (Vals AI)67.5%Not measuredOnly Claude Haiku 4.5 measured
MortgageTax (Vals AI)62.2%Not measuredOnly Claude Haiku 4.5 measured
MedQA (Vals AI)79.6%Not measuredOnly Claude Haiku 4.5 measured
MedCode (Vals AI)32.7%Not measuredOnly Claude Haiku 4.5 measured
MMLU Pro (Artificial Analysis run)Not measured76.0%Only Mistral Medium 3 measured
SimpleQA Verified13.2%Not measuredOnly Claude Haiku 4.5 measured
LMArena Text: science14061381Claude Haiku 4.5
LMArena Text: medicine and healthcare13941381Claude Haiku 4.5
LMArena Text: legal and government14001384Claude Haiku 4.5
LMArena Text: business and finance14001352Claude Haiku 4.5
Neither model has a result on the other 4 boards here
Web designLike-for-likePublic boards, shown as published, kept out of the index51
Web design benchmarks for Claude Haiku 4.5 and Mistral Medium 3
BenchmarkClaude Haiku 4.5Mistral Medium 3Leader
Design Arena: websites11221079Claude Haiku 4.5
Design Arena: UI components11001024Claude Haiku 4.5
Design Arena: game dev10971018Claude Haiku 4.5
Design Arena: data viz11241034Claude Haiku 4.5
Design Arena: 3D10721084Mistral Medium 3
Design Arena: all code categories11151069Claude Haiku 4.5
Design Arena: SVG1026Not measuredOnly Claude Haiku 4.5 measured
Design Arena: ASCII art1140Not measuredOnly Claude Haiku 4.5 measured
LiveBench design59.9%Not measuredOnly Claude Haiku 4.5 measured
GeneralLike-for-likePublic boards, shown as published, kept out of the index162
General benchmarks for Claude Haiku 4.5 and Mistral Medium 3
BenchmarkClaude Haiku 4.5Mistral Medium 3Leader
LiveBench data analysis59.3%Not measuredOnly Claude Haiku 4.5 measured
Public Benefits Bench (Vals AI)54.3%Not measuredOnly Claude Haiku 4.5 measured
SAGE (Vals AI)31.8%Not measuredOnly Claude Haiku 4.5 measured
MedScribe (Vals AI)85.2%Not measuredOnly Claude Haiku 4.5 measured
Vals Multimodal Index42.9%Not measuredOnly Claude Haiku 4.5 measured
IFBenchNot measured39.3%Only Mistral Medium 3 measured
Long context reasoning (AA-LCR)Not measured31.3%Only Mistral Medium 3 measured
DTBench73.6%62.3%Claude Haiku 4.5
LMCA30.9%Not measuredOnly Claude Haiku 4.5 measured
ExploitBench13.7%Not measuredOnly Claude Haiku 4.5 measured
LMArena Text13971370Claude Haiku 4.5
LMArena Text: instruction following14141338Claude Haiku 4.5
LMArena Text: creative writing13711343Claude Haiku 4.5
LMArena VisionNot measured1157Only Mistral Medium 3 measured
LMArena Text: English14141385Claude Haiku 4.5
LMArena Text: non-English13771353Claude Haiku 4.5
LMArena Text: Chinese14181374Claude Haiku 4.5
LMArena Text: German13741377Mistral Medium 3
LMArena Text: Japanese13381316Claude Haiku 4.5
LMArena Text: Korean13461304Claude Haiku 4.5
LMArena Text: French14111368Claude Haiku 4.5
LMArena Text: Spanish14211364Claude Haiku 4.5
LMArena Text: Russian13811359Claude Haiku 4.5
LMArena Text: Polish13431371Mistral Medium 3
LMArena Text: multi-turn14091384Claude Haiku 4.5
LMArena Text: longer queries14271360Claude Haiku 4.5
LMArena Text: writing and language13861352Claude Haiku 4.5
LMArena Text: entertainment and media13691335Claude Haiku 4.5
LMArena Vision: EnglishNot measured1172Only Mistral Medium 3 measured
LMArena Vision: ChineseNot measured1161Only Mistral Medium 3 measured
LMArena Vision: reading textNot measured1154Only Mistral Medium 3 measured
LMArena Vision: humorNot measured1145Only Mistral Medium 3 measured
LMArena Vision: captioningNot measured1094Only Mistral Medium 3 measured
LMArena Vision: recognizing thingsNot measured1141Only Mistral Medium 3 measured
LMArena Vision: creative writingNot measured1146Only Mistral Medium 3 measured
LMArena Document1420Not measuredOnly Claude Haiku 4.5 measured
Neither model has a result on the other 10 boards here
Image generationNot comparablePublic boards, shown as published, kept out of the index0 boards, none shared
Image generation benchmarks for Claude Haiku 4.5 and Mistral Medium 3
BenchmarkClaude Haiku 4.5Mistral Medium 3Leader
Neither model has a result on 5 boards here

What each workload costs

Three fixed token mixes at each model's listed price, so per-token rates become a bill.

Chat turn

1K input + 500 output tokens

Claude Haiku 4.5$0.0035Fits in one request
Mistral Medium 3$0.0014Fits in one request

Mistral Medium 3 costs less

Repository review

50K input + 3K output tokens

Claude Haiku 4.5$0.065Fits in one request
Mistral Medium 3$0.026Fits in one request

Mistral Medium 3 costs less

Agent loop

200K input + 10K output tokens

Claude Haiku 4.5$0.250Exceeds the context window
Mistral Medium 3$0.100Exceeds the context window

Mistral Medium 3 costs less

Listed OpenRouter rates, without cache or batch discounts. A workload that does not fit a model's context window would need splitting.

Specification differences

The leading value in a row is marked; a row with a missing value names no leader. Our two rows are marked in red.

Specifications of Claude Haiku 4.5 and Mistral Medium 3
SpecificationAnthropic Claude Haiku 4.5Mistral Medium 3
MakerAnthropicMistral AI
WeightsNo public weights listedNo public weights listed
ReleasedOctober 15, 2025May 7, 2025
Context window200K131K
Input $/Mtok$1.00$0.40
Output $/Mtok$5.00$2.00
Coding index35.6Not benchmarked
Independent measurements behind it40
Cost per solved task$0.56Not computable
SourceOpenRouter listingOpenRouter listing

Questions

Is Claude Haiku 4.5 better than Mistral Medium 3 for coding?

Only Claude Haiku 4.5 has a coding score, 35.6 on the Vibe Coding Index; Mistral Medium 3 has none, so the two cannot be ranked on coding. Pick Mistral Medium 3 for output tokens 2.5x cheaper ($2.00 vs $5.00 per million) and work measured by Design Arena: 3D or LMArena Text: German, where it leads.

Which is cheaper, Claude Haiku 4.5 or Mistral Medium 3?

Claude Haiku 4.5 costs $1.00 per million input tokens and $5.00 per million output tokens; Mistral Medium 3 costs $0.40 and $2.00. Cost per solved task is known for Claude Haiku 4.5 only.

Which has the bigger context window, Claude Haiku 4.5 or Mistral Medium 3?

Claude Haiku 4.5, with 200K tokens against 131K.

How many benchmarks is the Claude Haiku 4.5 vs Mistral Medium 3 comparison based on?

37 benchmarks have a result for both models as of October 21, 2026. Claude Haiku 4.5's coding index rests on 4 independent benchmarks and Mistral Medium 3's on 0. Where only one model has a result, the page says so instead of naming a winner.

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