Noometry

Model comparison

Gemma 4 26B A4B IT vs GPT-5.1-Codex

Gemma 4 26B A4B IT is the stronger model overall, scoring 43.1 to 38.2 on the Noometry Index.

Last verified . 2 shared benchmarks.

Gemma 4 26B A4B IT Google

43.1

Rank #88 Confirmed

GPT-5.1-Codex OpenAI

38.2

Rank #178 Reported

Summary

  • They share 2 benchmarks with published results for both. Gemma 4 26B A4B IT scores higher in 1 category and GPT-5.1-Codex in 1 category; 2 gaps are clear of the uncertainty.
  • The widest gap is in math, where Gemma 4 26B A4B IT leads 45.7 to 29.3.
  • Gemma 4 26B A4B IT is cheaper at $0.0765 / $0.26 per million input/output tokens, against $1.25 / $10 for GPT-5.1-Codex.
  • GPT-5.1-Codex accepts more context: 400K tokens versus 262K.
  • Gemma 4 26B A4B IT has downloadable open weights; the other is API-only.

Side by side

Gemma 4 26B A4B ITGPT-5.1-Codex
ProviderGoogleOpenAI
Noometry Index43.138.2
Released2026-04-022025-11-12
WeightsOpenProprietary
Context window262K400K
Max output33K128K
Input $ / M tokens$0.0765$1.25
Output $ / M tokens$0.26$10
Results tracked286

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Category by category

Coding GPT-5.1-Codex leads

Gemma 4 26B A4B IT: 38.8 (#156), GPT-5.1-Codex: 41.7 (#107)

BenchmarkGemma 4 26B A4B ITGPT-5.1-Codex
LMArena WebDev13591337
ALE-Bench927.171,245
SWE-bench Verified (bash only)—66%
SciCode40%—
WeirdML35.2%—
LMArena Coding1446—

Agentic & Tool Use Not comparable

Gemma 4 26B A4B IT: —, GPT-5.1-Codex: 37.8 (#32)

BenchmarkGemma 4 26B A4B ITGPT-5.1-Codex
Terminal-Bench—60.4%
METR Time Horizons—70.8%

Reasoning Not comparable

Gemma 4 26B A4B IT: 21.1 (#205), GPT-5.1-Codex: —

BenchmarkGemma 4 26B A4B ITGPT-5.1-Codex
CritPt0%—
Chess Puzzles6%—
LMArena Hard Prompts1438—
DTBench74.9%—
LMCA29.7%—
Epoch Capabilities Index141.85—

Math Gemma 4 26B A4B IT leads

Gemma 4 26B A4B IT: 45.7 (#61), GPT-5.1-Codex: 29.3 (#218)

BenchmarkGemma 4 26B A4B ITGPT-5.1-Codex
OTIS Mock AIME 2024-202582.2%—
ProofBench—9%
LMArena Math1469—

Knowledge Not comparable

Gemma 4 26B A4B IT: 45.6 (#79), GPT-5.1-Codex: —

BenchmarkGemma 4 26B A4B ITGPT-5.1-Codex
GPQA Diamond73.2%—
Vectara Hallucination Rate5.2%—
LMArena Expert1447—

Multimodal Not comparable

Gemma 4 26B A4B IT: 39.9 (#43), GPT-5.1-Codex: —

BenchmarkGemma 4 26B A4B ITGPT-5.1-Codex
LMArena Vision1260—

Multilingual Not comparable

Gemma 4 26B A4B IT: 53.3 (#68), GPT-5.1-Codex: —

BenchmarkGemma 4 26B A4B ITGPT-5.1-Codex
LMArena Non-English1422—
LMArena Chinese1495—
LMArena French1459—
LMArena Russian1434—
LMArena Spanish1415—

Instruction Following Not comparable

Gemma 4 26B A4B IT: 75.0 (#78), GPT-5.1-Codex: —

BenchmarkGemma 4 26B A4B ITGPT-5.1-Codex
LMArena Instruction Following1420—

Long Context Not comparable

Gemma 4 26B A4B IT: 43.6 (#87), GPT-5.1-Codex: —

BenchmarkGemma 4 26B A4B ITGPT-5.1-Codex
LMArena Longer Query1427—

Writing & Preference Not comparable

Gemma 4 26B A4B IT: 58.8 (#110), GPT-5.1-Codex: —

BenchmarkGemma 4 26B A4B ITGPT-5.1-Codex
LMArena Text1434—
LMArena Creative Writing1401—
EQ-Bench Creative Writing1305—
LMArena Multi-Turn1442—

Frequently asked questions

Is Gemma 4 26B A4B IT better than GPT-5.1-Codex?

Gemma 4 26B A4B IT is the stronger model overall, scoring 43.1 to 38.2 on the Noometry Index.

Which is cheaper, Gemma 4 26B A4B IT or GPT-5.1-Codex?

Gemma 4 26B A4B IT is cheaper. It lists at $0.0765 per million input tokens and $0.26 per million output tokens; GPT-5.1-Codex lists at $1.25 and $10.

Is Gemma 4 26B A4B IT or GPT-5.1-Codex better for coding?

GPT-5.1-Codex scores higher on coding benchmarks: 41.7 versus 38.8 in the Noometry coding category.

Which has the bigger context window?

GPT-5.1-Codex does, with 400K tokens against 262K.

How many benchmarks do Gemma 4 26B A4B IT and GPT-5.1-Codex share?

2 benchmarks have published results for both models. Gemma 4 26B A4B IT has 28 scored results on Noometry and GPT-5.1-Codex has 6.

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