Model comparison
GPT-5.1-Codex vs Sonar
GPT-5.1-Codex and Sonar score almost the same on the Noometry Index (38.6 vs 38.5), so choose on price, context window or the category you care about most.
Last verified . 0 shared benchmarks.
PerplexitySummary
- The widest gap is in coding, where GPT-5.1-Codex leads 41.9 to 35.7.
- Sonar is cheaper at $1 / $1 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.
Side by side
| GPT-5.1-Codex | Sonar | |
|---|---|---|
| Provider | OpenAI | Perplexity |
| Noometry Index | 38.6 | 38.5 |
| Released | 2025-11-12 | 2024-01-01 |
| Weights | Proprietary | Proprietary |
| Context window | 400K | 128K |
| Max output | 128K | 4K |
| Input $ / M tokens | $1.25 | $1 |
| Output $ / M tokens | $10 | $1 |
| Results tracked | 6 | 7 |
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Category by category
Coding GPT-5.1-Codex leads
GPT-5.1-Codex: 41.9 (#116), Sonar: 35.7 (#221)
| Benchmark | GPT-5.1-Codex | Sonar |
|---|---|---|
| SWE-bench Verified (bash only) | 66% | — |
| LMArena WebDev | 1337 | — |
| LiveBench Coding | — | 35.1% |
| ALE-Bench | 1,245 | — |
Agentic & Tool Use Not comparable
GPT-5.1-Codex: 38.0 (#33), Sonar: —
| Benchmark | GPT-5.1-Codex | Sonar |
|---|---|---|
| Terminal-Bench | 60.4% | — |
| METR Time Horizons | 70.8% | — |
Reasoning Not comparable
GPT-5.1-Codex: —, Sonar: 21.1 (#227)
| Benchmark | GPT-5.1-Codex | Sonar |
|---|---|---|
| LiveBench Reasoning | — | 46.3% |
| LiveBench Data Analysis | — | 37.9% |
| LiveBench | — | 46.9% |
Math Sonar leads
GPT-5.1-Codex: 30.3 (#235), Sonar: 33.7 (#200)
| Benchmark | GPT-5.1-Codex | Sonar |
|---|---|---|
| ProofBench | 9% | — |
| LiveBench Math | — | 41.6% |
Instruction Following Not comparable
GPT-5.1-Codex: —, Sonar: 71.4 (#150)
| Benchmark | GPT-5.1-Codex | Sonar |
|---|---|---|
| LiveBench Instruction Following | — | 76.2% |
Writing & Preference Not comparable
GPT-5.1-Codex: —, Sonar: 52.6 (#167)
| Benchmark | GPT-5.1-Codex | Sonar |
|---|---|---|
| LiveBench Language | — | 44.1% |
Frequently asked questions
Is GPT-5.1-Codex better than Sonar?
GPT-5.1-Codex and Sonar score almost the same on the Noometry Index (38.6 vs 38.5), so choose on price, context window or the category you care about most.
Which is cheaper, GPT-5.1-Codex or Sonar?
Sonar is cheaper. It lists at $1 per million input tokens and $1 per million output tokens; GPT-5.1-Codex lists at $1.25 and $10.
Is GPT-5.1-Codex or Sonar better for coding?
GPT-5.1-Codex scores higher on coding benchmarks: 41.9 versus 35.7 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 Sonar share?
0 benchmarks have published results for both models. GPT-5.1-Codex has 6 scored results on Noometry and Sonar has 7.