Model comparison
GPT-5.5 Instant vs Llama 3.1 Nemotron Ultra 253b v1
GPT-5.5 Instant is the stronger model overall, scoring 42.7 to 36.7 on the Noometry Index.
Last verified . 10 shared benchmarks.
NVIDIASummary
- They share 10 benchmarks with published results for both. GPT-5.5 Instant scores higher in 5 categories and Llama 3.1 Nemotron Ultra 253b v1 in 2 categories; 7 gaps are clear of the uncertainty.
- The widest gap is in math, where Llama 3.1 Nemotron Ultra 253b v1 leads 37.5 to 26.5.
- Llama 3.1 Nemotron Ultra 253b v1 has downloadable open weights; the other is API-only.
Side by side
| GPT-5.5 Instant | Llama 3.1 Nemotron Ultra 253b v1 | |
|---|---|---|
| Provider | OpenAI | NVIDIA |
| Noometry Index | 42.7 | 36.7 |
| Released | 2026-05-05 | — |
| Weights | Proprietary | Open |
| Context window | — | — |
| Max output | — | — |
| Input $ / M tokens | — | — |
| Output $ / M tokens | — | — |
| Results tracked | 27 | 11 |
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Category by category
Coding GPT-5.5 Instant leads
GPT-5.5 Instant: 44.3 (#74), Llama 3.1 Nemotron Ultra 253b v1: 38.4 (#177)
| Benchmark | GPT-5.5 Instant | Llama 3.1 Nemotron Ultra 253b v1 |
|---|---|---|
| LMArena Coding | 1433 | 1312 |
| SciCode | 48.6% | — |
Agentic & Tool Use Not comparable
GPT-5.5 Instant: —, Llama 3.1 Nemotron Ultra 253b v1: 15.7 (#149)
| Benchmark | GPT-5.5 Instant | Llama 3.1 Nemotron Ultra 253b v1 |
|---|---|---|
| Berkeley Function Calling Leaderboard | — | 10% |
Reasoning Llama 3.1 Nemotron Ultra 253b v1 leads
GPT-5.5 Instant: 24.9 (#155), Llama 3.1 Nemotron Ultra 253b v1: 26.3 (#134)
| Benchmark | GPT-5.5 Instant | Llama 3.1 Nemotron Ultra 253b v1 |
|---|---|---|
| LMArena Hard Prompts | 1426 | 1316 |
| CritPt | 0% | — |
| Chess Puzzles | 12% | — |
| Epoch Capabilities Index | 142.52 | — |
Math Llama 3.1 Nemotron Ultra 253b v1 leads
GPT-5.5 Instant: 26.5 (#259), Llama 3.1 Nemotron Ultra 253b v1: 37.5 (#152)
| Benchmark | GPT-5.5 Instant | Llama 3.1 Nemotron Ultra 253b v1 |
|---|---|---|
| LMArena Math | 1420 | 1360 |
| FrontierMath (Tiers 1-3) | 26.3% | — |
| FrontierMath Tier 4 | 2.4% | — |
| OTIS Mock AIME 2024-2025 | 68.1% | — |
Knowledge Not comparable
GPT-5.5 Instant: 48.9 (#74), Llama 3.1 Nemotron Ultra 253b v1: —
| Benchmark | GPT-5.5 Instant | Llama 3.1 Nemotron Ultra 253b v1 |
|---|---|---|
| GPQA Diamond | 82.5% | — |
| LMArena Expert | 1409 | — |
Multimodal Not comparable
GPT-5.5 Instant: 40.0 (#52), Llama 3.1 Nemotron Ultra 253b v1: —
| Benchmark | GPT-5.5 Instant | Llama 3.1 Nemotron Ultra 253b v1 |
|---|---|---|
| LMArena Vision | 1250 | — |
| LMArena Document | 1403 | — |
Multilingual GPT-5.5 Instant leads
GPT-5.5 Instant: 52.8 (#80), Llama 3.1 Nemotron Ultra 253b v1: 43.1 (#187)
| Benchmark | GPT-5.5 Instant | Llama 3.1 Nemotron Ultra 253b v1 |
|---|---|---|
| LMArena Non-English | 1417 | 1282 |
| LMArena Russian | 1431 | 1284 |
| LMArena Chinese | 1456 | — |
| LMArena French | 1428 | — |
| LMArena German | 1411 | — |
| LMArena Japanese | 1408 | — |
| LMArena Korean | 1392 | — |
| LMArena Spanish | 1429 | — |
Instruction Following GPT-5.5 Instant leads
GPT-5.5 Instant: 74.2 (#100), Llama 3.1 Nemotron Ultra 253b v1: 69.0 (#178)
| Benchmark | GPT-5.5 Instant | Llama 3.1 Nemotron Ultra 253b v1 |
|---|---|---|
| LMArena Instruction Following | 1406 | 1308 |
Long Context GPT-5.5 Instant leads
GPT-5.5 Instant: 43.4 (#96), Llama 3.1 Nemotron Ultra 253b v1: 39.5 (#177)
| Benchmark | GPT-5.5 Instant | Llama 3.1 Nemotron Ultra 253b v1 |
|---|---|---|
| LMArena Longer Query | 1422 | 1299 |
Writing & Preference GPT-5.5 Instant leads
GPT-5.5 Instant: 61.8 (#85), Llama 3.1 Nemotron Ultra 253b v1: 52.2 (#175)
| Benchmark | GPT-5.5 Instant | Llama 3.1 Nemotron Ultra 253b v1 |
|---|---|---|
| LMArena Text | 1419 | 1320 |
| LMArena Creative Writing | 1419 | 1314 |
| LMArena Multi-Turn | 1433 | 1317 |
Frequently asked questions
Is GPT-5.5 Instant better than Llama 3.1 Nemotron Ultra 253b v1?
GPT-5.5 Instant is the stronger model overall, scoring 42.7 to 36.7 on the Noometry Index.
Is GPT-5.5 Instant or Llama 3.1 Nemotron Ultra 253b v1 better for coding?
GPT-5.5 Instant scores higher on coding benchmarks: 44.3 versus 38.4 in the Noometry coding category.
How many benchmarks do GPT-5.5 Instant and Llama 3.1 Nemotron Ultra 253b v1 share?
10 benchmarks have published results for both models. GPT-5.5 Instant has 27 scored results on Noometry and Llama 3.1 Nemotron Ultra 253b v1 has 11.