text model comparison
GPT-4.1 nano vs GPT-5.6 Luna
GPT-4.1 nano and GPT-5.6 Luna are both current text models, from OpenAI. GPT-4.1 nano is 50% cheaper per 1M input tokens than GPT-5.6 Luna, $0.10 vs $0.20. On Arena Text, GPT-4.1 nano scores 1322 Elo and GPT-5.6 Luna 1452 Elo (Arena, measured October 8, 2026). Both accept about 1.05M tokens of context (1,050,000 and 1,047,576).
Data verified October 12, 2026 · Dataset 2026-10-12
Side by side
Standard-tier prices in effect today. The better value in each row is highlighted.
| Fact | GPT-4.1 nano | GPT-5.6 Luna |
|---|---|---|
| Price per 1M input tokens | $0.10 (better) | $0.20 |
| Price per 1M output tokens | $0.40 (better) | $1.20 |
| Cost of 10M input and 2M output tokens | $1.80 (better) | $4.40 |
| Arena Text | 1322 Elo (#39 of 39) | 1452 Elo (#29 of 39) (better) |
| GPQA Diamond | 48.9% (#37 of 37) | 91.6% (#19 of 37) (better) |
| SimpleQA Verified | 6% (#34 of 34) | 41% (#26 of 34) (better) |
| FrontierMath Tiers 1-3 (v2) | Not measured | 82.1% (#12 of 37) |
| Provider | OpenAI | OpenAI |
| Release date | April 14, 2025 | July 9, 2026 |
| Access | API only | API only |
| Context window | 1,047,576 tokens | 1,050,000 tokens |
| Max output | 32,768 tokens | 128,000 tokens |
| Input | text, image | text, image |
| Output | text | text |
When to choose each
GPT-4.1 nano
Best for
- High-volume API screening at low published token prices
Watch out for
- Not in the pinned LiveBench snapshot; its independent scores here come from Epoch AI's own GPQA Diamond, FrontierMath and SimpleQA Verified runs
GPT-5.6 Luna
Best for
- High-volume API evaluation with published low token prices
- Subagents and batch reasoning where cost per call dominates
Watch out for
- Not in the pinned LiveBench snapshot; its independent scores here come from Epoch AI's own GPQA Diamond, FrontierMath and SimpleQA Verified runs
GPT-4.1 nano vs GPT-5.6 Luna FAQ
Which is cheaper, GPT-4.1 nano or GPT-5.6 Luna?
GPT-4.1 nano is 50% cheaper per 1M input tokens than GPT-5.6 Luna, $0.10 vs $0.20. For 10M input and 2M output tokens, GPT-4.1 nano costs $1.80 and GPT-5.6 Luna $4.40 at standard rates.
Which scores higher on independent benchmarks, GPT-4.1 nano or GPT-5.6 Luna?
GPT-5.6 Luna leads on Arena Text, 1452 Elo to 1322 Elo; GPT-5.6 Luna leads on GPQA Diamond, 91.6% to 48.9%; GPT-5.6 Luna leads on SimpleQA Verified, 41% to 6%. Scores are independent evaluations, not either vendor's launch figures.
Which has the larger context window, GPT-4.1 nano or GPT-5.6 Luna?
Both accept about 1.05M tokens of context (1,050,000 and 1,047,576).
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Production evaluation
Choosing between GPT-4.1 nano and GPT-5.6 Luna?
Public benchmarks narrow the shortlist. We run both on your own tasks, data and cost limits, then build the routing and review controls to run the winner in production.
- A head-to-head evaluation on your real workload
- Routing between models by cost and difficulty