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GPT-5 Nano vs Mistral Medium 3

GPT-5 Nano leads Mistral Medium 3 on the Artificial Analysis Intelligence Index, 13.0 to 9.0, and GPT-5 Nano costs 5.0x less per output token ($0.40 vs $2.00 per million). Updated October 21, 2026; 53 benchmarks have a result for both.

Replace GPT-5 Nano Replace Mistral Medium 3
GPT-5 NanoOpenAI
Coding
No data
Overall
13.0
Output $/M
$0.40
20
Mistral Medium 3Mistral AI
Coding
No data
Overall
9.0
Output $/M
$2.00
33
vs boards won of 53 shared

GPT-5 Nano or Mistral Medium 3: which to pick

Neither model has a coding score yet, so the two cannot be ranked on coding.

Pick GPT-5 Nano for output tokens 5.0x cheaper ($0.40 vs $2.00 per million) and a larger context window (400K against 131K tokens).

Model AGPT-5 NanoOpenAINot benchmarkedNo coding benchmark$0.109 per solved taskModel BMistral Medium 3Mistral AINot benchmarkedNo coding benchmarkNo cost per solved task
Shared results
53
GPT-5 Nano only
32
Mistral Medium 3 only
4
Like-for-like categories
8 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
GPT-5 Nano not benchmarked, Mistral Medium 3 not benchmarked.
Widest category
Math, 29.3 points apart on average over 4 shared benchmarks.
Widest single gap
AA Math Index: GPT-5 Nano 83.7 against Mistral Medium 3 30.3, 53.4 points apart on a 0 to 100 scale.
Output price
GPT-5 Nano $0.40 against Mistral Medium 3 $2.00 per million output tokens, 5.0x apart.
Context window
GPT-5 Nano takes 400K 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
CategoryGPT-5 NanoBarsMistral Medium 3Ties
Coding22
Intelligence20
Agentic work10
Reasoning25
Math22
Knowledge14
Web design51
General519
All shared boards2033
CodingLike-for-likeSix of these boards feed the Vibe Coding Index22
Coding benchmarks for GPT-5 Nano and Mistral Medium 3
BenchmarkGPT-5 NanoMistral Medium 3Leader
SWE-bench Verified34.8%Not measuredOnly GPT-5 Nano measured
LiveCodeBench (Vals AI)70.2%Not measuredOnly GPT-5 Nano measured
LiveCodeBench (Artificial Analysis run)78.9%40.0%GPT-5 Nano
Terminal-Bench Hard (Artificial Analysis run)17.4%3.8%GPT-5 Nano
Terminal-Bench21.8%Not measuredOnly GPT-5 Nano measured
WeirdML38.1%Not measuredOnly GPT-5 Nano measured
LMArena Text: coding13511385Mistral Medium 3
LMArena Text: software and IT13451385Mistral Medium 3
Neither model has a result on the other 30 boards here
IntelligenceLike-for-likePublic boards, shown as published, kept out of the index20
Intelligence benchmarks for GPT-5 Nano and Mistral Medium 3
BenchmarkGPT-5 NanoMistral Medium 3Leader
AA Intelligence Index13.09.0GPT-5 Nano
Epoch Capabilities Index139.2134.0GPT-5 Nano
Agentic workLike-for-likePublic boards, shown as published, kept out of the index10
Agentic work benchmarks for GPT-5 Nano and Mistral Medium 3
BenchmarkGPT-5 NanoMistral Medium 3Leader
τ²-Bench Telecom36.5%24.3%GPT-5 Nano
Neither model has a result on the other 38 boards here
ReasoningLike-for-likePublic boards, shown as published, kept out of the index25
Reasoning benchmarks for GPT-5 Nano and Mistral Medium 3
BenchmarkGPT-5 NanoMistral Medium 3Leader
GPQA Diamond63.4%Not measuredOnly GPT-5 Nano measured
MMMU Pro (Vals AI)70.9%Not measuredOnly GPT-5 Nano measured
GPQA Diamond (Artificial Analysis run)67.6%57.8%GPT-5 Nano
Humanity's Last Exam (Artificial Analysis run)9.5%4.1%GPT-5 Nano
GPQA Diamond (Epoch AI run)69.4%Not measuredOnly GPT-5 Nano measured
ARC-AGI20.7%Not measuredOnly GPT-5 Nano measured
ARC-AGI-22.6%Not measuredOnly GPT-5 Nano measured
Chess puzzles22.0%Not measuredOnly GPT-5 Nano measured
Mystery game puzzles9.0%Not measuredOnly GPT-5 Nano measured
VPCT37.2%Not measuredOnly GPT-5 Nano measured
LMArena Text: hard prompts13281364Mistral Medium 3
LMArena Text: expert13211342Mistral Medium 3
LMArena Text: hard prompts in English13381374Mistral Medium 3
LMArena Vision: diagrams11411155Mistral Medium 3
LMArena Vision: homework11571165Mistral Medium 3
Neither model has a result on the other 6 boards here
MathLike-for-likePublic boards, shown as published, kept out of the index22
Math benchmarks for GPT-5 Nano and Mistral Medium 3
BenchmarkGPT-5 NanoMistral Medium 3Leader
AIME81.2%Not measuredOnly GPT-5 Nano measured
MATH 500 (Vals AI)93.8%Not measuredOnly GPT-5 Nano measured
MGSM (Vals AI)89.3%Not measuredOnly GPT-5 Nano measured
AA Math Index83.730.3GPT-5 Nano
AIME 2025 (Artificial Analysis run)83.7%30.3%GPT-5 Nano
OTIS Mock AIME81.1%Not measuredOnly GPT-5 Nano measured
FrontierMath, tiers 1 to 320.0%Not measuredOnly GPT-5 Nano measured
FrontierMath, tier 42.4%Not measuredOnly GPT-5 Nano measured
ProofBench12.0%Not measuredOnly GPT-5 Nano measured
MATH level 595.2%Not measuredOnly GPT-5 Nano measured
LMArena Text: math13171353Mistral Medium 3
LMArena Text: mathematical work13261354Mistral Medium 3
Neither model has a result on the other 1 board here
KnowledgeLike-for-likePublic boards, shown as published, kept out of the index14
Knowledge benchmarks for GPT-5 Nano and Mistral Medium 3
BenchmarkGPT-5 NanoMistral Medium 3Leader
MMLU Pro76.1%Not measuredOnly GPT-5 Nano measured
LegalBench (Vals AI)50.1%Not measuredOnly GPT-5 Nano measured
CaseLaw (Vals AI)52.6%Not measuredOnly GPT-5 Nano measured
TaxEval (Vals AI)67.4%Not measuredOnly GPT-5 Nano measured
MortgageTax (Vals AI)53.6%Not measuredOnly GPT-5 Nano measured
MedQA (Vals AI)93.3%Not measuredOnly GPT-5 Nano measured
MedCode (Vals AI)30.4%Not measuredOnly GPT-5 Nano measured
MMLU Pro (Artificial Analysis run)78.0%76.0%GPT-5 Nano
SimpleQA Verified11.7%Not measuredOnly GPT-5 Nano measured
LMArena Text: science13181381Mistral Medium 3
LMArena Text: medicine and healthcare13351381Mistral Medium 3
LMArena Text: legal and government12981384Mistral Medium 3
LMArena Text: business and finance13111352Mistral Medium 3
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 GPT-5 Nano and Mistral Medium 3
BenchmarkGPT-5 NanoMistral Medium 3Leader
Design Arena: websites11011079GPT-5 Nano
Design Arena: UI components10671024GPT-5 Nano
Design Arena: game dev10451018GPT-5 Nano
Design Arena: data viz10561034GPT-5 Nano
Design Arena: 3D9661084Mistral Medium 3
Design Arena: all code categories10841069GPT-5 Nano
Neither model has a result on the other 3 boards here
GeneralLike-for-likePublic boards, shown as published, kept out of the index519
General benchmarks for GPT-5 Nano and Mistral Medium 3
BenchmarkGPT-5 NanoMistral Medium 3Leader
SAGE (Vals AI)30.4%Not measuredOnly GPT-5 Nano measured
MedScribe (Vals AI)72.9%Not measuredOnly GPT-5 Nano measured
IFBench67.6%39.3%GPT-5 Nano
Long context reasoning (AA-LCR)45.0%31.3%GPT-5 Nano
DTBench62.7%62.3%GPT-5 Nano
LMCA7.9%Not measuredOnly GPT-5 Nano measured
Fiction.LiveBench44.4%Not measuredOnly GPT-5 Nano measured
LMArena Text13201370Mistral Medium 3
LMArena Text: instruction following13061338Mistral Medium 3
LMArena Text: creative writing12491343Mistral Medium 3
LMArena Vision11591157GPT-5 Nano
LMArena Text: English13211385Mistral Medium 3
LMArena Text: non-English13131353Mistral Medium 3
LMArena Text: Chinese13561374Mistral Medium 3
LMArena Text: German13271377Mistral Medium 3
LMArena Text: Japanese12271316Mistral Medium 3
LMArena Text: Korean12691304Mistral Medium 3
LMArena Text: FrenchNot measured1368Only Mistral Medium 3 measured
LMArena Text: Spanish13601364Mistral Medium 3
LMArena Text: Russian12961359Mistral Medium 3
LMArena Text: Polish13141371Mistral Medium 3
LMArena Text: multi-turn13111384Mistral Medium 3
LMArena Text: longer queries13121360Mistral Medium 3
LMArena Text: writing and language12831352Mistral Medium 3
LMArena Text: entertainment and media12681335Mistral Medium 3
LMArena Vision: English11701172Mistral Medium 3
LMArena Vision: Chinese11761161GPT-5 Nano
LMArena Vision: reading text11521154Mistral Medium 3
LMArena Vision: humor11101145Mistral Medium 3
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
Neither model has a result on the other 14 boards here
Image generationNot comparablePublic boards, shown as published, kept out of the index0 boards, none shared
Image generation benchmarks for GPT-5 Nano and Mistral Medium 3
BenchmarkGPT-5 NanoMistral 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

GPT-5 Nano$0.0003Fits in one request
Mistral Medium 3$0.0014Fits in one request

GPT-5 Nano costs less

Repository review

50K input + 3K output tokens

GPT-5 Nano$0.0037Fits in one request
Mistral Medium 3$0.026Fits in one request

GPT-5 Nano costs less

Agent loop

200K input + 10K output tokens

GPT-5 Nano$0.014Fits in one request
Mistral Medium 3$0.100Exceeds the context window

GPT-5 Nano 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 GPT-5 Nano and Mistral Medium 3
SpecificationOpenAI GPT-5 NanoMistral Medium 3
MakerOpenAIMistral AI
WeightsNo public weights listedNo public weights listed
ReleasedAugust 7, 2025May 7, 2025
Context window400K131K
Input $/Mtok$0.05$0.40
Output $/Mtok$0.40$2.00
Coding indexNot benchmarkedNot benchmarked
Independent measurements behind it00
Cost per solved task$0.109Not computable
SourceOpenRouter listingOpenRouter listing

Questions

Is GPT-5 Nano better than Mistral Medium 3 for coding?

Neither model has a coding score yet, so the two cannot be ranked on coding. Pick GPT-5 Nano for output tokens 5.0x cheaper ($0.40 vs $2.00 per million) and a larger context window (400K against 131K tokens).

Which is cheaper, GPT-5 Nano or Mistral Medium 3?

GPT-5 Nano costs $0.05 per million input tokens and $0.40 per million output tokens; Mistral Medium 3 costs $0.40 and $2.00. Cost per solved task is known for GPT-5 Nano only.

Which has the bigger context window, GPT-5 Nano or Mistral Medium 3?

GPT-5 Nano, with 400K tokens against 131K.

How many benchmarks is the GPT-5 Nano vs Mistral Medium 3 comparison based on?

53 benchmarks have a result for both models as of October 21, 2026. GPT-5 Nano's coding index rests on 0 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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