Model comparison
GPT-5.1-Codex vs Llama 4 Scout
GPT-5.1-Codex is the stronger model overall, scoring 38.6 to 27.7 on the Noometry Index. Llama 4 Scout costs 23× less per token, which makes it the better buy when GPT-5.1-Codex's lead doesn't matter for your workload.
Last verified . 1 shared benchmarks.
MetaSummary
- They share 1 benchmark with published results for both. GPT-5.1-Codex scores higher in 3 categories and Llama 4 Scout in 0 categories; 3 gaps are clear of the uncertainty.
- The widest gap is in coding, where GPT-5.1-Codex leads 41.9 to 20.2.
- The biggest single-benchmark swing is SWE-bench Verified (bash only): 66% for GPT-5.1-Codex and 9.1% for Llama 4 Scout.
- Llama 4 Scout is cheaper at $0.10 / $0.30 per million input/output tokens, against $1.25 / $10 for GPT-5.1-Codex.
- GPT-5.1-Codex accepts more context: 400K tokens versus 128K.
- Llama 4 Scout has downloadable open weights; the other is API-only.
Side by side
| GPT-5.1-Codex | Llama 4 Scout | |
|---|---|---|
| Provider | OpenAI | Meta |
| Noometry Index | 38.6 | 27.7 |
| Released | 2025-11-12 | 2025-04-05 |
| Weights | Proprietary | Open |
| Context window | 400K | 128K |
| Max output | 128K | 4K |
| Input $ / M tokens | $1.25 | $0.10 |
| Output $ / M tokens | $10 | $0.30 |
| Results tracked | 6 | 43 |
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Category by category
Coding GPT-5.1-Codex leads
GPT-5.1-Codex: 41.9 (#116), Llama 4 Scout: 20.2 (#339)
| Benchmark | GPT-5.1-Codex | Llama 4 Scout |
|---|---|---|
| SWE-bench Verified (bash only) | 66% | 9.1% |
| LMArena WebDev | 1337 | — |
| SciCode | — | 17% |
| LMArena Coding | — | 1286 |
| BigCodeBench Complete | — | 43.1% |
| ALE-Bench | 1,245 | — |
Agentic & Tool Use GPT-5.1-Codex leads
GPT-5.1-Codex: 38.0 (#33), Llama 4 Scout: 24.6 (#119)
| Benchmark | GPT-5.1-Codex | Llama 4 Scout |
|---|---|---|
| Terminal-Bench | 60.4% | — |
| Berkeley Function Calling Leaderboard | — | 28.1% |
| METR Time Horizons | 70.8% | — |
Reasoning Not comparable
GPT-5.1-Codex: —, Llama 4 Scout: 9.1 (#345)
| Benchmark | GPT-5.1-Codex | Llama 4 Scout |
|---|---|---|
| ARC-AGI-2 | — | 0% |
| Kagi LLM Benchmark | — | 36.9% |
| ARC-AGI-1 | — | 0.5% |
| CritPt | — | 0% |
| LMArena Hard Prompts | — | 1266 |
| DTBench | — | 57.9% |
| LMCA | — | 12% |
| Epoch Capabilities Index | — | 129.64 |
| ForecastBench | — | 57.5 |
Math GPT-5.1-Codex leads
GPT-5.1-Codex: 30.3 (#235), Llama 4 Scout: 19.6 (#286)
| Benchmark | GPT-5.1-Codex | Llama 4 Scout |
|---|---|---|
| OTIS Mock AIME 2024-2025 | — | 7.8% |
| ProofBench | 9% | — |
| Omni-MATH | — | 37.3% |
| LMArena Math | — | 1287 |
| MATH Level 5 | — | 62.3% |
| FrontierMath (Feb 2025 set) | — | 0% |
Knowledge Not comparable
GPT-5.1-Codex: —, Llama 4 Scout: 31.9 (#217)
| Benchmark | GPT-5.1-Codex | Llama 4 Scout |
|---|---|---|
| GPQA Diamond | — | 51.8% |
| MMLU-Pro | — | 74.2% |
| Vectara Hallucination Rate | — | 7.7% |
| GPQA (HELM) | — | 50.7% |
| LMArena Expert | — | 1235 |
Multimodal Not comparable
GPT-5.1-Codex: —, Llama 4 Scout: 32.2 (#102)
| Benchmark | GPT-5.1-Codex | Llama 4 Scout |
|---|---|---|
| LMArena Vision | — | 1118 |
| SpatialViz-Bench | — | 34.2% |
Multilingual Not comparable
GPT-5.1-Codex: —, Llama 4 Scout: 41.0 (#212)
| Benchmark | GPT-5.1-Codex | Llama 4 Scout |
|---|---|---|
| LMArena Non-English | — | 1252 |
| LMArena Chinese | — | 1255 |
| LMArena French | — | 1282 |
| LMArena German | — | 1272 |
| LMArena Japanese | — | 1206 |
| LMArena Korean | — | 1207 |
| LMArena Russian | — | 1263 |
| LMArena Spanish | — | 1278 |
Instruction Following Not comparable
GPT-5.1-Codex: —, Llama 4 Scout: 65.8 (#217)
| Benchmark | GPT-5.1-Codex | Llama 4 Scout |
|---|---|---|
| IFEval | — | 81.8% |
| LMArena Instruction Following | — | 1248 |
Long Context Not comparable
GPT-5.1-Codex: —, Llama 4 Scout: 27.5 (#294)
| Benchmark | GPT-5.1-Codex | Llama 4 Scout |
|---|---|---|
| Fiction.LiveBench | — | 36% |
| LMArena Longer Query | — | 1265 |
Writing & Preference Not comparable
GPT-5.1-Codex: —, Llama 4 Scout: 37.0 (#261)
| Benchmark | GPT-5.1-Codex | Llama 4 Scout |
|---|---|---|
| LMArena Text | — | 1279 |
| LMArena Creative Writing | — | 1249 |
| EQ-Bench Creative Writing | — | 783 |
| WildBench | — | 78% |
| LMArena Multi-Turn | — | 1280 |
Frequently asked questions
Is GPT-5.1-Codex better than Llama 4 Scout?
GPT-5.1-Codex is the stronger model overall, scoring 38.6 to 27.7 on the Noometry Index. Llama 4 Scout costs 23× less per token, which makes it the better buy when GPT-5.1-Codex's lead doesn't matter for your workload.
Which is cheaper, GPT-5.1-Codex or Llama 4 Scout?
Llama 4 Scout is cheaper. It lists at $0.10 per million input tokens and $0.30 per million output tokens; GPT-5.1-Codex lists at $1.25 and $10.
Is GPT-5.1-Codex or Llama 4 Scout better for coding?
GPT-5.1-Codex scores higher on coding benchmarks: 41.9 versus 20.2 in the Noometry coding category.
Which has the bigger context window?
GPT-5.1-Codex does, with 400K tokens against 128K.
How many benchmarks do GPT-5.1-Codex and Llama 4 Scout share?
1 benchmark has published results for both models. GPT-5.1-Codex has 6 scored results on Noometry and Llama 4 Scout has 43.