Model comparison
Gemini 1.5 Flash 8B vs GPT-5.1-Codex
GPT-5.1-Codex is the stronger model overall, scoring 38.2 to 29.7 on the Noometry Index.
Last verified . 0 shared benchmarks.
GoogleSummary
- The widest gap is in math, where GPT-5.1-Codex leads 29.3 to 13.3.
Side by side
| Gemini 1.5 Flash 8B | GPT-5.1-Codex | |
|---|---|---|
| Provider | OpenAI | |
| Noometry Index | 29.7 | 38.2 |
| Released | 2024-10-03 | 2025-11-12 |
| Weights | Proprietary | Proprietary |
| Context window | — | 400K |
| Max output | — | 128K |
| Input $ / M tokens | — | $1.25 |
| Output $ / M tokens | — | $10 |
| Results tracked | 21 | 6 |
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Category by category
Coding GPT-5.1-Codex leads
Gemini 1.5 Flash 8B: 34.9 (#221), GPT-5.1-Codex: 41.7 (#107)
| Benchmark | Gemini 1.5 Flash 8B | GPT-5.1-Codex |
|---|---|---|
| SWE-bench Verified (bash only) | — | 66% |
| LMArena WebDev | — | 1337 |
| LMArena Coding | 1218 | — |
| ALE-Bench | — | 1,245 |
Agentic & Tool Use Not comparable
Gemini 1.5 Flash 8B: —, GPT-5.1-Codex: 37.8 (#32)
| Benchmark | Gemini 1.5 Flash 8B | GPT-5.1-Codex |
|---|---|---|
| Terminal-Bench | — | 60.4% |
| METR Time Horizons | — | 70.8% |
Reasoning Not comparable
Gemini 1.5 Flash 8B: 19.2 (#242), GPT-5.1-Codex: —
| Benchmark | Gemini 1.5 Flash 8B | GPT-5.1-Codex |
|---|---|---|
| LMArena Hard Prompts | 1210 | — |
| DTBench | 50% | — |
Math GPT-5.1-Codex leads
Gemini 1.5 Flash 8B: 13.3 (#296), GPT-5.1-Codex: 29.3 (#218)
| Benchmark | Gemini 1.5 Flash 8B | GPT-5.1-Codex |
|---|---|---|
| OTIS Mock AIME 2024-2025 | 4.6% | — |
| ProofBench | — | 9% |
| LMArena Math | 1207 | — |
Knowledge Not comparable
Gemini 1.5 Flash 8B: 16.0 (#285), GPT-5.1-Codex: —
| Benchmark | Gemini 1.5 Flash 8B | GPT-5.1-Codex |
|---|---|---|
| GPQA Diamond | 33% | — |
| LMArena Expert | 1185 | — |
Multimodal Not comparable
Gemini 1.5 Flash 8B: 27.6 (#110), GPT-5.1-Codex: —
| Benchmark | Gemini 1.5 Flash 8B | GPT-5.1-Codex |
|---|---|---|
| LMArena Vision | 1044 | — |
Multilingual Not comparable
Gemini 1.5 Flash 8B: 38.6 (#224), GPT-5.1-Codex: —
| Benchmark | Gemini 1.5 Flash 8B | GPT-5.1-Codex |
|---|---|---|
| LMArena Non-English | 1215 | — |
| LMArena Chinese | 1231 | — |
| LMArena French | 1233 | — |
| LMArena German | 1206 | — |
| LMArena Japanese | 1150 | — |
| LMArena Korean | 1140 | — |
| LMArena Russian | 1236 | — |
| LMArena Spanish | 1212 | — |
Instruction Following Not comparable
Gemini 1.5 Flash 8B: 63.1 (#231), GPT-5.1-Codex: —
| Benchmark | Gemini 1.5 Flash 8B | GPT-5.1-Codex |
|---|---|---|
| LMArena Instruction Following | 1199 | — |
Long Context Not comparable
Gemini 1.5 Flash 8B: 36.9 (#220), GPT-5.1-Codex: —
| Benchmark | Gemini 1.5 Flash 8B | GPT-5.1-Codex |
|---|---|---|
| LMArena Longer Query | 1219 | — |
Writing & Preference Not comparable
Gemini 1.5 Flash 8B: 43.0 (#227), GPT-5.1-Codex: —
| Benchmark | Gemini 1.5 Flash 8B | GPT-5.1-Codex |
|---|---|---|
| LMArena Text | 1226 | — |
| LMArena Creative Writing | 1218 | — |
| LMArena Multi-Turn | 1185 | — |
Frequently asked questions
Is Gemini 1.5 Flash 8B better than GPT-5.1-Codex?
GPT-5.1-Codex is the stronger model overall, scoring 38.2 to 29.7 on the Noometry Index.
Is Gemini 1.5 Flash 8B or GPT-5.1-Codex better for coding?
GPT-5.1-Codex scores higher on coding benchmarks: 41.7 versus 34.9 in the Noometry coding category.
How many benchmarks do Gemini 1.5 Flash 8B and GPT-5.1-Codex share?
0 benchmarks have published results for both models. Gemini 1.5 Flash 8B has 21 scored results on Noometry and GPT-5.1-Codex has 6.