Model comparison
GPT-5.5 Instant vs Sonar
GPT-5.5 Instant is the stronger model overall, scoring 42.7 to 38.5 on the Noometry Index.
Last verified . 0 shared benchmarks.
PerplexitySummary
- The widest gap is in writing & preference, where GPT-5.5 Instant leads 61.8 to 52.6.
Side by side
| GPT-5.5 Instant | Sonar | |
|---|---|---|
| Provider | OpenAI | Perplexity |
| Noometry Index | 42.7 | 38.5 |
| Released | 2026-05-05 | 2024-01-01 |
| Weights | Proprietary | Proprietary |
| Context window | — | 128K |
| Max output | — | 4K |
| Input $ / M tokens | — | $1 |
| Output $ / M tokens | — | $1 |
| Results tracked | 27 | 7 |
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Category by category
Coding GPT-5.5 Instant leads
GPT-5.5 Instant: 44.3 (#74), Sonar: 35.7 (#221)
| Benchmark | GPT-5.5 Instant | Sonar |
|---|---|---|
| SciCode | 48.6% | — |
| LiveBench Coding | — | 35.1% |
| LMArena Coding | 1433 | — |
Reasoning GPT-5.5 Instant leads
GPT-5.5 Instant: 24.9 (#155), Sonar: 21.1 (#227)
| Benchmark | GPT-5.5 Instant | Sonar |
|---|---|---|
| CritPt | 0% | — |
| Chess Puzzles | 12% | — |
| LiveBench Reasoning | — | 46.3% |
| LMArena Hard Prompts | 1426 | — |
| LiveBench Data Analysis | — | 37.9% |
| Epoch Capabilities Index | 142.52 | — |
| LiveBench | — | 46.9% |
Math Sonar leads
GPT-5.5 Instant: 26.5 (#259), Sonar: 33.7 (#200)
| Benchmark | GPT-5.5 Instant | Sonar |
|---|---|---|
| FrontierMath (Tiers 1-3) | 26.3% | — |
| FrontierMath Tier 4 | 2.4% | — |
| OTIS Mock AIME 2024-2025 | 68.1% | — |
| LiveBench Math | — | 41.6% |
| LMArena Math | 1420 | — |
Knowledge Not comparable
GPT-5.5 Instant: 48.9 (#74), Sonar: —
| Benchmark | GPT-5.5 Instant | Sonar |
|---|---|---|
| GPQA Diamond | 82.5% | — |
| LMArena Expert | 1409 | — |
Multimodal Not comparable
GPT-5.5 Instant: 40.0 (#52), Sonar: —
| Benchmark | GPT-5.5 Instant | Sonar |
|---|---|---|
| LMArena Vision | 1250 | — |
| LMArena Document | 1403 | — |
Multilingual Not comparable
GPT-5.5 Instant: 52.8 (#80), Sonar: —
| Benchmark | GPT-5.5 Instant | Sonar |
|---|---|---|
| LMArena Non-English | 1417 | — |
| LMArena Chinese | 1456 | — |
| LMArena French | 1428 | — |
| LMArena German | 1411 | — |
| LMArena Japanese | 1408 | — |
| LMArena Korean | 1392 | — |
| LMArena Russian | 1431 | — |
| LMArena Spanish | 1429 | — |
Instruction Following GPT-5.5 Instant leads
GPT-5.5 Instant: 74.2 (#100), Sonar: 71.4 (#150)
| Benchmark | GPT-5.5 Instant | Sonar |
|---|---|---|
| LiveBench Instruction Following | — | 76.2% |
| LMArena Instruction Following | 1406 | — |
Long Context Not comparable
GPT-5.5 Instant: 43.4 (#96), Sonar: —
| Benchmark | GPT-5.5 Instant | Sonar |
|---|---|---|
| LMArena Longer Query | 1422 | — |
Writing & Preference GPT-5.5 Instant leads
GPT-5.5 Instant: 61.8 (#85), Sonar: 52.6 (#167)
| Benchmark | GPT-5.5 Instant | Sonar |
|---|---|---|
| LMArena Text | 1419 | — |
| LMArena Creative Writing | 1419 | — |
| LMArena Multi-Turn | 1433 | — |
| LiveBench Language | — | 44.1% |
Frequently asked questions
Is GPT-5.5 Instant better than Sonar?
GPT-5.5 Instant is the stronger model overall, scoring 42.7 to 38.5 on the Noometry Index.
Is GPT-5.5 Instant or Sonar better for coding?
GPT-5.5 Instant scores higher on coding benchmarks: 44.3 versus 35.7 in the Noometry coding category.
How many benchmarks do GPT-5.5 Instant and Sonar share?
0 benchmarks have published results for both models. GPT-5.5 Instant has 27 scored results on Noometry and Sonar has 7.