Model comparison
GPT-5.3 Chat vs Sonar
GPT-5.3 Chat is the stronger model overall, scoring 42.8 to 38.5 on the Noometry Index. Sonar costs 4.8× less per token, which makes it the better buy when GPT-5.3 Chat's lead doesn't matter for your workload.
Last verified . 0 shared benchmarks.
PerplexitySummary
- The widest gap is in writing & preference, where GPT-5.3 Chat leads 63.1 to 52.6.
- Sonar is cheaper at $1 / $1 per million input/output tokens, against $1.75 / $14 for GPT-5.3 Chat.
Side by side
| GPT-5.3 Chat | Sonar | |
|---|---|---|
| Provider | OpenAI | Perplexity |
| Noometry Index | 42.8 | 38.5 |
| Released | 2026-03-03 | 2024-01-01 |
| Weights | Proprietary | Proprietary |
| Context window | 128K | 128K |
| Max output | 16K | 4K |
| Input $ / M tokens | $1.75 | $1 |
| Output $ / M tokens | $14 | $1 |
| Results tracked | 18 | 7 |
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Category by category
Coding GPT-5.3 Chat leads
GPT-5.3 Chat: 41.4 (#124), Sonar: 35.7 (#221)
| Benchmark | GPT-5.3 Chat | Sonar |
|---|---|---|
| LiveBench Coding | — | 35.1% |
| LMArena Coding | 1408 | — |
Reasoning GPT-5.3 Chat leads
GPT-5.3 Chat: 28.5 (#102), Sonar: 21.1 (#227)
| Benchmark | GPT-5.3 Chat | Sonar |
|---|---|---|
| LiveBench Reasoning | — | 46.3% |
| LMArena Hard Prompts | 1399 | — |
| LiveBench Data Analysis | — | 37.9% |
| LiveBench | — | 46.9% |
Math GPT-5.3 Chat leads
GPT-5.3 Chat: 38.2 (#142), Sonar: 33.7 (#200)
| Benchmark | GPT-5.3 Chat | Sonar |
|---|---|---|
| LiveBench Math | — | 41.6% |
| LMArena Math | 1389 | — |
Knowledge Not comparable
GPT-5.3 Chat: 38.8 (#140), Sonar: —
| Benchmark | GPT-5.3 Chat | Sonar |
|---|---|---|
| LMArena Expert | 1397 | — |
Multilingual Not comparable
GPT-5.3 Chat: 50.3 (#124), Sonar: —
| Benchmark | GPT-5.3 Chat | Sonar |
|---|---|---|
| LMArena Non-English | 1382 | — |
| LMArena Chinese | 1432 | — |
| LMArena French | 1397 | — |
| LMArena German | 1384 | — |
| LMArena Japanese | 1352 | — |
| LMArena Korean | 1346 | — |
| LMArena Russian | 1400 | — |
| LMArena Spanish | 1371 | — |
Instruction Following GPT-5.3 Chat leads
GPT-5.3 Chat: 72.8 (#129), Sonar: 71.4 (#150)
| Benchmark | GPT-5.3 Chat | Sonar |
|---|---|---|
| LiveBench Instruction Following | — | 76.2% |
| LMArena Instruction Following | 1378 | — |
Long Context Not comparable
GPT-5.3 Chat: 42.6 (#120), Sonar: —
| Benchmark | GPT-5.3 Chat | Sonar |
|---|---|---|
| LMArena Longer Query | 1396 | — |
Writing & Preference GPT-5.3 Chat leads
GPT-5.3 Chat: 63.1 (#68), Sonar: 52.6 (#167)
| Benchmark | GPT-5.3 Chat | Sonar |
|---|---|---|
| LMArena Text | 1389 | — |
| LMArena Creative Writing | 1355 | — |
| EQ-Bench Creative Writing | 1690 | — |
| LMArena Multi-Turn | 1412 | — |
| LiveBench Language | — | 44.1% |
Frequently asked questions
Is GPT-5.3 Chat better than Sonar?
GPT-5.3 Chat is the stronger model overall, scoring 42.8 to 38.5 on the Noometry Index. Sonar costs 4.8× 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 Sonar?
Sonar is cheaper. It lists at $1 per million input tokens and $1 per million output tokens; GPT-5.3 Chat lists at $1.75 and $14.
Is GPT-5.3 Chat or Sonar better for coding?
GPT-5.3 Chat scores higher on coding benchmarks: 41.4 versus 35.7 in the Noometry coding category.
Which has the bigger context window?
Both accept 128K tokens.
How many benchmarks do GPT-5.3 Chat and Sonar share?
0 benchmarks have published results for both models. GPT-5.3 Chat has 18 scored results on Noometry and Sonar has 7.