text model comparison
Gemini 3.1 Flash-Lite vs GPT-5.6 Luna
Gemini 3.1 Flash-Lite and GPT-5.6 Luna are both current text models, from Google and OpenAI. GPT-5.6 Luna is 20% cheaper per 1M input tokens than Gemini 3.1 Flash-Lite, $0.20 vs $0.25. On GPQA Diamond, Gemini 3.1 Flash-Lite scores 81.8% and GPT-5.6 Luna 91.6% (Epoch AI, measured October 12, 2026). Both accept about 1.05M tokens of context (1,050,000 and 1,048,576).
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 | Gemini 3.1 Flash-Lite | GPT-5.6 Luna |
|---|---|---|
| Price per 1M input tokens | $0.25 | $0.20 (better) |
| Price per 1M output tokens | $1.50 | $1.20 (better) |
| Cost of 10M input and 2M output tokens | $5.50 | $4.40 (better) |
| GPQA Diamond | 81.8% (#33 of 37) | 91.6% (#19 of 37) (better) |
| FrontierMath Tiers 1-3 (v2) | 27.7% (#33 of 37) | 82.1% (#12 of 37) (better) |
| Arena Text | Not measured | 1452 Elo (#29 of 39) |
| SimpleQA Verified | Not measured | 41% (#26 of 34) |
| Provider | OpenAI | |
| Release date | May 7, 2026 | July 9, 2026 |
| Access | API only | API only |
| Context window | 1,048,576 tokens | 1,050,000 tokens |
| Max output | 65,536 tokens | 128,000 tokens |
| Input | text, image, audio, video | text, image |
| Output | text | text |
When to choose each
Gemini 3.1 Flash-Lite
Best for
- High-volume multimodal extraction and translation
Watch out for
- The published price for audio input differs from the listed text, image, and video input price
- Google's earliest published shutdown date is 2027-05-07; migrate to gemini-3.5-flash-lite.
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
Gemini 3.1 Flash-Lite vs GPT-5.6 Luna FAQ
Which is cheaper, Gemini 3.1 Flash-Lite or GPT-5.6 Luna?
GPT-5.6 Luna is 20% cheaper per 1M input tokens than Gemini 3.1 Flash-Lite, $0.20 vs $0.25. For 10M input and 2M output tokens, Gemini 3.1 Flash-Lite costs $5.50 and GPT-5.6 Luna $4.40 at standard rates.
Which scores higher on independent benchmarks, Gemini 3.1 Flash-Lite or GPT-5.6 Luna?
GPT-5.6 Luna leads on GPQA Diamond, 91.6% to 81.8%; GPT-5.6 Luna leads on FrontierMath Tiers 1-3 (v2), 82.1% to 27.7%. Scores are independent evaluations, not either vendor's launch figures.
Which has the larger context window, Gemini 3.1 Flash-Lite or GPT-5.6 Luna?
Both accept about 1.05M tokens of context (1,050,000 and 1,048,576).
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Production evaluation
Choosing between Gemini 3.1 Flash-Lite 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