# 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.

- Canonical page: https://noometry.com/compare/gpt-5-3-codex-vs-nova-premier-1-0
- Last updated: 2026-10-11
- Shared benchmarks: 0

## 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.

## Snapshot

| | GPT-5.3 Codex | Nova Premier 1.0 |
|---|---|---|
| Provider | OpenAI | Amazon |
| Noometry Index | 45.8 | 38.3 |
| Rank | 69 | 189 |
| Context | 400K | 1M |
| Input $/M | $1.75 | $2.50 |
| Output $/M | $14 | $12.50 |
| Weights | Proprietary | Proprietary |

## Coding

- 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

- 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

- 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

- GPT-5.3 Codex: —
- Nova Premier 1.0: 33.8 (#199)

| Benchmark | GPT-5.3 Codex | Nova Premier 1.0 |
|---|---|---|
| Omni-MATH | — | 35% |

## Knowledge

- 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

- 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

- GPT-5.3 Codex: —
- Nova Premier 1.0: 51.0 (#178)

| Benchmark | GPT-5.3 Codex | Nova Premier 1.0 |
|---|---|---|
| WildBench | — | 78.8% |

## FAQ

### 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.