Model comparison

GPT-5.3 Chat vs Mistral Medium 3.1

GPT-5.3 Chat is the stronger model overall, scoring 42.1 to 31.5 on the Noometry Index. Mistral Medium 3.1 costs 6.0× less per token, which makes it the better buy when GPT-5.3 Chat's lead doesn't matter for your workload.

Last verified October 10, 2026. 1 shared benchmarks.

GPT-5.3 Chat OpenAI

42.1

Rank #109 Confirmed

Mistral Medium 3.1

Mistral AI

31.5

Rank #260 Reported

Summary

They share 1 benchmark with published results for both. GPT-5.3 Chat scores higher in 2 categories and Mistral Medium 3.1 in 0 categories; 2 gaps are clear of the uncertainty.
The widest gap is in reasoning, where GPT-5.3 Chat leads 27.3 to 10.1.
Mistral Medium 3.1 is cheaper at $0.40 / $2 per million input/output tokens, against $1.75 / $14 for GPT-5.3 Chat.
Mistral Medium 3.1 accepts more context: 131K tokens versus 128K.

Side by side

GPT-5.3 Chat and Mistral Medium 3.1 specifications
	GPT-5.3 Chat	Mistral Medium 3.1
Provider	OpenAI	Mistral AI
Noometry Index	42.1	31.5
Released	2026-03-03	—
Weights	Proprietary	Proprietary
Context window	128K	131K
Max output	16K	105K
Input $ / M tokens	$1.75	$0.40
Output $ / M tokens	$14	$2
Results tracked	18	3

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Category by category

Coding Not comparable

GPT-5.3 Chat: 40.8 (#124), Mistral Medium 3.1: —

Coding benchmarks
Benchmark	GPT-5.3 Chat	Mistral Medium 3.1
LMArena Coding	1408	—

Reasoning GPT-5.3 Chat leads

GPT-5.3 Chat: 27.3 (#105), Mistral Medium 3.1: 10.1 (#336)

Reasoning benchmarks
Benchmark	GPT-5.3 Chat	Mistral Medium 3.1
NYT Connections (extended)	—	6.5%
Thematic Generalization	—	20.3%
LMArena Hard Prompts	1399	—

Math Not comparable

GPT-5.3 Chat: 35.4 (#146), Mistral Medium 3.1: —

Math benchmarks
Benchmark	GPT-5.3 Chat	Mistral Medium 3.1
LMArena Math	1389	—

Knowledge Not comparable

GPT-5.3 Chat: 38.2 (#137), Mistral Medium 3.1: —

Knowledge benchmarks
Benchmark	GPT-5.3 Chat	Mistral Medium 3.1
LMArena Expert	1397	—

Multilingual Not comparable

GPT-5.3 Chat: 50.5 (#119), Mistral Medium 3.1: —

Multilingual benchmarks
Benchmark	GPT-5.3 Chat	Mistral Medium 3.1
LMArena Non-English	1383	—
LMArena Chinese	1433	—
LMArena French	1398	—
LMArena German	1384	—
LMArena Japanese	1351	—
LMArena Korean	1347	—
LMArena Russian	1400	—
LMArena Spanish	1371	—

Instruction Following Not comparable

GPT-5.3 Chat: 73.0 (#124), Mistral Medium 3.1: —

Instruction Following benchmarks
Benchmark	GPT-5.3 Chat	Mistral Medium 3.1
LMArena Instruction Following	1378	—

Long Context Not comparable

GPT-5.3 Chat: 42.6 (#115), Mistral Medium 3.1: —

Long Context benchmarks
Benchmark	GPT-5.3 Chat	Mistral Medium 3.1
LMArena Longer Query	1396	—

Writing & Preference GPT-5.3 Chat leads

GPT-5.3 Chat: 63.3 (#65), Mistral Medium 3.1: 55.6 (#140)

Writing & Preference benchmarks
Benchmark	GPT-5.3 Chat	Mistral Medium 3.1
EQ-Bench Creative Writing	1690	1476
LMArena Text	1389	—
LMArena Creative Writing	1356	—
LMArena Multi-Turn	1413	—

Frequently asked questions

Is GPT-5.3 Chat better than Mistral Medium 3.1?

Which is cheaper, GPT-5.3 Chat or Mistral Medium 3.1?

Mistral Medium 3.1 is cheaper. It lists at $0.40 per million input tokens and $2 per million output tokens; GPT-5.3 Chat lists at $1.75 and $14.

Which has the bigger context window?

Mistral Medium 3.1 does, with 131K tokens against 128K.

How many benchmarks do GPT-5.3 Chat and Mistral Medium 3.1 share?

1 benchmark has published results for both models. GPT-5.3 Chat has 18 scored results on Noometry and Mistral Medium 3.1 has 3.