Noometry

Model comparison

GPT-5.3 Chat vs Magistral Medium

GPT-5.3 Chat is the stronger model overall, scoring 42.1 to 34.8 on the Noometry Index. Magistral Medium costs 1.8× less per token, which makes it the better buy when GPT-5.3 Chat's lead doesn't matter for your workload.

Last verified . 17 shared benchmarks.

GPT-5.3 Chat OpenAI

42.1

Rank #109 Confirmed

Magistral Medium Mistral AI

34.8

Rank #224 Confirmed

Summary

  • They share 17 benchmarks with published results for both. GPT-5.3 Chat scores higher in 8 categories and Magistral Medium in 0 categories; 8 gaps are clear of the uncertainty.
  • The widest gap is in reasoning, where GPT-5.3 Chat leads 27.3 to 8.7.
  • Magistral Medium is cheaper at $2 / $5 per million input/output tokens, against $1.75 / $14 for GPT-5.3 Chat.
  • Magistral Medium has downloadable open weights; the other is API-only.

Side by side

GPT-5.3 ChatMagistral Medium
ProviderOpenAIMistral AI
Noometry Index42.134.8
Released2026-03-032025-03-17
WeightsProprietaryOpen
Context window128K128K
Max output16K16K
Input $ / M tokens$1.75$2
Output $ / M tokens$14$5
Results tracked1822

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Category by category

Coding GPT-5.3 Chat leads

GPT-5.3 Chat: 40.8 (#124), Magistral Medium: 38.6 (#161)

BenchmarkGPT-5.3 ChatMagistral Medium
LMArena Coding14081319
SciCode—39.2%

Reasoning GPT-5.3 Chat leads

GPT-5.3 Chat: 27.3 (#105), Magistral Medium: 8.7 (#342)

BenchmarkGPT-5.3 ChatMagistral Medium
LMArena Hard Prompts13991267
ARC-AGI-2—0%
Kagi LLM Benchmark—16.2%
ARC-AGI-1—6.1%
CritPt—0.3%

Math GPT-5.3 Chat leads

GPT-5.3 Chat: 35.4 (#146), Magistral Medium: 32.4 (#187)

BenchmarkGPT-5.3 ChatMagistral Medium
LMArena Math13891249

Knowledge GPT-5.3 Chat leads

GPT-5.3 Chat: 38.2 (#137), Magistral Medium: 32.9 (#199)

BenchmarkGPT-5.3 ChatMagistral Medium
LMArena Expert13971222

Multilingual GPT-5.3 Chat leads

GPT-5.3 Chat: 50.5 (#119), Magistral Medium: 39.8 (#219)

BenchmarkGPT-5.3 ChatMagistral Medium
LMArena Non-English13831232
LMArena Chinese14331225
LMArena French13981268
LMArena German13841248
LMArena Japanese13511176
LMArena Korean13471125
LMArena Russian14001224
LMArena Spanish13711269

Instruction Following GPT-5.3 Chat leads

GPT-5.3 Chat: 73.0 (#124), Magistral Medium: 66.2 (#207)

BenchmarkGPT-5.3 ChatMagistral Medium
LMArena Instruction Following13781254

Long Context GPT-5.3 Chat leads

GPT-5.3 Chat: 42.6 (#115), Magistral Medium: 39.3 (#178)

BenchmarkGPT-5.3 ChatMagistral Medium
LMArena Longer Query13961295

Writing & Preference GPT-5.3 Chat leads

GPT-5.3 Chat: 63.3 (#65), Magistral Medium: 46.5 (#214)

BenchmarkGPT-5.3 ChatMagistral Medium
LMArena Text13891255
LMArena Creative Writing13561245
LMArena Multi-Turn14131275
EQ-Bench Creative Writing1690—

Frequently asked questions

Is GPT-5.3 Chat better than Magistral Medium?

GPT-5.3 Chat is the stronger model overall, scoring 42.1 to 34.8 on the Noometry Index. Magistral Medium costs 1.8× less per token, which makes it the better buy when GPT-5.3 Chat's lead doesn't matter for your workload.

Which is cheaper, GPT-5.3 Chat or Magistral Medium?

Magistral Medium is cheaper. It lists at $2 per million input tokens and $5 per million output tokens; GPT-5.3 Chat lists at $1.75 and $14.

Is GPT-5.3 Chat or Magistral Medium better for coding?

GPT-5.3 Chat scores higher on coding benchmarks: 40.8 versus 38.6 in the Noometry coding category.

Which has the bigger context window?

Both accept 128K tokens.

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

17 benchmarks have published results for both models. GPT-5.3 Chat has 18 scored results on Noometry and Magistral Medium has 22.

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