Model comparison
GPT-5.3 Codex vs Nova Premier 1.0
GPT-5.3 Codex is the stronger model overall, scoring 45.8 to 38.3 on the Noometry Index.
Last verified . 0 shared benchmarks.
Summary
- Both cost about the same: $1.75 input and $14 output per million tokens.
- Nova Premier 1.0 accepts more context: 1M tokens versus 400K.
Side by side
| GPT-5.3 Codex | Nova Premier 1.0 | |
|---|---|---|
| Provider | OpenAI | Amazon |
| Noometry Index | 45.8 | 38.3 |
| Released | 2026-02-05 | 2025-04-30 |
| Weights | Proprietary | Proprietary |
| Context window | 400K | 1M |
| Max output | 128K | 10K |
| Input $ / M tokens | $1.75 | $2.50 |
| Output $ / M tokens | $14 | $12.50 |
| Results tracked | 8 | 6 |
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Category by category
Coding Not comparable
GPT-5.3 Codex: 48.6 (#56), Nova Premier 1.0: —
| Benchmark | GPT-5.3 Codex | Nova Premier 1.0 |
|---|---|---|
| SWE-bench Verified | 74.8% | — |
| LMArena WebDev | 1409 | — |
| WeirdML | 79.3% | — |
| ALE-Bench | 1,655 | — |
Agentic & Tool Use Not comparable
GPT-5.3 Codex: 48.0 (#9), Nova Premier 1.0: —
| Benchmark | GPT-5.3 Codex | Nova Premier 1.0 |
|---|---|---|
| Terminal-Bench | 78.4% | — |
| METR Time Horizons | 74.5% | — |
| Vending-Bench 2 | 5,940 | — |
Reasoning Not comparable
GPT-5.3 Codex: —, Nova Premier 1.0: 23.0 (#185)
| Benchmark | GPT-5.3 Codex | Nova Premier 1.0 |
|---|---|---|
| Kagi LLM Benchmark | — | 44.8% |
| Epoch Capabilities Index | 156.77 | — |
Math Not comparable
GPT-5.3 Codex: —, Nova Premier 1.0: 33.8 (#199)
| Benchmark | GPT-5.3 Codex | Nova Premier 1.0 |
|---|---|---|
| Omni-MATH | — | 35% |
Knowledge Not comparable
GPT-5.3 Codex: —, Nova Premier 1.0: 35.8 (#180)
| Benchmark | GPT-5.3 Codex | Nova Premier 1.0 |
|---|---|---|
| MMLU-Pro | — | 72.6% |
| GPQA (HELM) | — | 51.8% |
Instruction Following Not comparable
GPT-5.3 Codex: —, Nova Premier 1.0: 66.8 (#204)
| Benchmark | GPT-5.3 Codex | Nova Premier 1.0 |
|---|---|---|
| IFEval | — | 80.3% |
Writing & Preference Not comparable
GPT-5.3 Codex: —, Nova Premier 1.0: 51.0 (#178)
| Benchmark | GPT-5.3 Codex | Nova Premier 1.0 |
|---|---|---|
| WildBench | — | 78.8% |
Frequently asked questions
Is GPT-5.3 Codex better than Nova Premier 1.0?
GPT-5.3 Codex is the stronger model overall, scoring 45.8 to 38.3 on the Noometry Index.
Which is cheaper, GPT-5.3 Codex or Nova Premier 1.0?
GPT-5.3 Codex is cheaper. It lists at $1.75 per million input tokens and $14 per million output tokens; Nova Premier 1.0 lists at $2.50 and $12.50.
Which has the bigger context window?
Nova Premier 1.0 does, with 1M tokens against 400K.
How many benchmarks do GPT-5.3 Codex and Nova Premier 1.0 share?
0 benchmarks have published results for both models. GPT-5.3 Codex has 8 scored results on Noometry and Nova Premier 1.0 has 6.