# GPT-5.1-Codex vs Nova Premier 1.0

> GPT-5.1-Codex and Nova Premier 1.0 score almost the same on the Noometry Index (38.6 vs 38.3), so choose on price, context window or the category you care about most.

- Canonical page: https://noometry.com/compare/gpt-5-1-codex-vs-nova-premier-1-0
- Last updated: 2026-10-12
- Shared benchmarks: 0

## Summary

- The widest gap is in math, where Nova Premier 1.0 leads 33.8 to 30.3.
- GPT-5.1-Codex is cheaper at $1.25 / $10 per million input/output tokens, against $2.50 / $12.50 for Nova Premier 1.0.
- Nova Premier 1.0 accepts more context: 1M tokens versus 400K.

## Snapshot

| | GPT-5.1-Codex | Nova Premier 1.0 |
|---|---|---|
| Provider | OpenAI | Amazon |
| Noometry Index | 38.6 | 38.3 |
| Rank | 186 | 189 |
| Context | 400K | 1M |
| Input $/M | $1.25 | $2.50 |
| Output $/M | $10 | $12.50 |
| Weights | Proprietary | Proprietary |

## Coding

- GPT-5.1-Codex: 41.9 (#116)
- Nova Premier 1.0: —

| Benchmark | GPT-5.1-Codex | Nova Premier 1.0 |
|---|---|---|
| SWE-bench Verified (bash only) | 66% | — |
| LMArena WebDev | 1337 | — |
| ALE-Bench | 1,245 | — |

## Agentic & Tool Use

- GPT-5.1-Codex: 38.0 (#33)
- Nova Premier 1.0: —

| Benchmark | GPT-5.1-Codex | Nova Premier 1.0 |
|---|---|---|
| Terminal-Bench | 60.4% | — |
| METR Time Horizons | 70.8% | — |

## Reasoning

- GPT-5.1-Codex: —
- Nova Premier 1.0: 23.0 (#185)

| Benchmark | GPT-5.1-Codex | Nova Premier 1.0 |
|---|---|---|
| Kagi LLM Benchmark | — | 44.8% |

## Math

- GPT-5.1-Codex: 30.3 (#235)
- Nova Premier 1.0: 33.8 (#199)

| Benchmark | GPT-5.1-Codex | Nova Premier 1.0 |
|---|---|---|
| ProofBench | 9% | — |
| Omni-MATH | — | 35% |

## Knowledge

- GPT-5.1-Codex: —
- Nova Premier 1.0: 35.8 (#180)

| Benchmark | GPT-5.1-Codex | Nova Premier 1.0 |
|---|---|---|
| MMLU-Pro | — | 72.6% |
| GPQA (HELM) | — | 51.8% |

## Instruction Following

- GPT-5.1-Codex: —
- Nova Premier 1.0: 66.8 (#204)

| Benchmark | GPT-5.1-Codex | Nova Premier 1.0 |
|---|---|---|
| IFEval | — | 80.3% |

## Writing & Preference

- GPT-5.1-Codex: —
- Nova Premier 1.0: 51.0 (#178)

| Benchmark | GPT-5.1-Codex | Nova Premier 1.0 |
|---|---|---|
| WildBench | — | 78.8% |

## FAQ

### Is GPT-5.1-Codex better than Nova Premier 1.0?

GPT-5.1-Codex and Nova Premier 1.0 score almost the same on the Noometry Index (38.6 vs 38.3), so choose on price, context window or the category you care about most.

### Which is cheaper, GPT-5.1-Codex or Nova Premier 1.0?

GPT-5.1-Codex is cheaper. It lists at $1.25 per million input tokens and $10 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-5.1-Codex and Nova Premier 1.0 share?

0 benchmarks have published results for both models. GPT-5.1-Codex has 6 scored results on Noometry and Nova Premier 1.0 has 6.