AI model comparison
GPT-6 Luna vs Gemini 2.5 Flash Lite
Side by side comparison of GPT-6 Luna and Gemini 2.5 Flash Lite on pricing, benchmark scores, context window, and more.
GPT-6 Luna is the fast, cost-efficient model in OpenAI's GPT-6 series, positioned below GPT-6 Sol.
- Input / 1M
- $0.10
- Output / 1M
- $0.50
- Context
- 1.05M
Gemini 2.5 Flash-Lite is a lightweight reasoning model in the Gemini 2.5 family, optimized for ultra-low latency and cost efficiency.
- Input / 1M
- $0.10
- Output / 1M
- $0.40
- Context
- 1.05M
Comparing image generators? Compare image models
At a glance
Quick verdict
How the two models stack up on the things people ask about most.
Lower price
Gemini 2.5 Flash Lite
1.1x cheaper for a typical chat
Higher intelligence score
Not available
Not enough benchmark data
Larger context window
GPT-6 Luna
1.05M vs 1.05M tokens
Newer release
GPT-6 Luna
Released September 22, 2026
Benchmarks
Benchmark scores
Independent scores from Artificial Analysis. Higher is better.
Intelligence index
GPT-6 Luna27.8Gemini 2.5 Flash LiteNot availableCoding index
GPT-6 LunaNot availableGemini 2.5 Flash LiteNot availableAgentic index
GPT-6 LunaNot availableGemini 2.5 Flash LiteNot availablePricing
GPT-6 Luna vs Gemini 2.5 Flash Lite API pricing
Per-token API rates. Cheaper option highlighted.
| Metric | GPT-6 Luna | Gemini 2.5 Flash Lite |
|---|---|---|
| Input tokensPer 1M tokens | $0.10 | $0.10 |
| Output tokensPer 1M tokens | $0.50 | $0.40 |
| Cached input (read)Per 1M tokens | $0.01 | $0.01 |
| Cache writePer 1M tokens | $0.13 | $0.08 |
| Long-context pricingPer 1M tokens, for very long prompts | $0.20 in / $0.75 out above 272K | Same rate at any length |
| Web searchPer request | $0.01 | $0.014 |
What it costs in practice
Estimated cost per 1,000 requests at standard rates. Coding and long-document figures also show the cost when the input is already cached.
Chat message
2K in, 500 out
GPT-6 Luna$0.45Gemini 2.5 Flash Lite$0.40Coding task
30K in, 4K out
GPT-6 Luna$5$2.30 cachedGemini 2.5 Flash Lite$4.60$1.90 cachedLong document summary
150K in, 2K out
GPT-6 Luna$16$2.50 cachedGemini 2.5 Flash Lite$15.80$2.30 cachedSpecs
Context window and capabilities
How much each model can read, how much it can write, and what it accepts as input.
| Metric | GPT-6 Luna | Gemini 2.5 Flash Lite |
|---|---|---|
| Context window | 1.05M tokens | 1.05M tokens |
| Max output | 128K tokens | 66K tokens |
| Input types | File, Image, Text | Audio, File, Image, Text, Video |
| Output types | Text | Text |
| Reasoning effort levels | Max, Extra high, High, Medium, Low, None | Not available |
| Default reasoning effort | Medium | Not available |
| Release date | September 22, 2026 | July 22, 2025 |
Features
Supported features
API features available for each model.
| Metric | GPT-6 Luna | Gemini 2.5 Flash Lite |
|---|---|---|
| Tool calling | Supported | Supported |
| Structured outputs | Supported | Supported |
| JSON mode | Supported | Supported |
| Reasoning | Supported | Supported |
| Temperature | Not supported | Supported |
| Stop sequences | Not supported | Supported |
| Deterministic seed | Supported | Supported |
| Verbosity control | Supported | Not supported |
Keep exploring
More on these models
Other head-to-heads, the full model page, and the alternatives list for each model.
GPT-6 LunaView full model details- GPT-6 Luna vs DeepSeek V4.1 Flash 1017
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Gemini 2.5 Flash LiteView full model details- Gemini 2.5 Flash Lite vs DeepSeek V4.1 Flash 1017
- Gemini 2.5 Flash Lite vs DeepSeek V4.1 Flash
- Gemini 2.5 Flash Lite vs GLM 5.3 Flash
- Gemini 2.5 Flash Lite vs MiMo-V2.6-Flash
- Gemini 2.5 Flash Lite vs DeepSeek V4 Flash 0731
- Gemini 2.5 Flash Lite vs Hy3
- Gemini 2.5 Flash Lite vs Claude Haiku 5.5
- Gemini 2.5 Flash Lite vs Gemma 4 31B
- Gemini 2.5 Flash Lite vs Gemma 4 26B A4B
Our take
Gemini 2.5 Flash Lite is 1.1x cheaper for a typical chat. GPT-6 Luna has the larger context window (1.05M vs 1.05M tokens). The right pick depends on your workload, so the quickest way to settle it is to send the same prompt to both and compare.
FAQ
Frequently asked questions
Is GPT-6 Luna or Gemini 2.5 Flash Lite cheaper?
Gemini 2.5 Flash Lite is cheaper for a typical chat (2K input tokens and 500 output tokens). Gemini 2.5 Flash Lite costs $0.10 per 1M input tokens and $0.40 per 1M output tokens, while GPT-6 Luna costs $0.10 per 1M input tokens and $0.50 per 1M output tokens.
Which has a bigger context window, GPT-6 Luna or Gemini 2.5 Flash Lite?
GPT-6 Luna supports up to 1.05M tokens of context, compared with 1.05M for Gemini 2.5 Flash Lite.
Can I use GPT-6 Luna and Gemini 2.5 Flash Lite at the same time?
Yes. Shortcut Chat sends one prompt to multiple models at once, so you can see GPT-6 Luna and Gemini 2.5 Flash Lite answer side by side and keep the better response.
Why choose? Ask both.
Send one prompt to GPT-6 Luna and Gemini 2.5 Flash Lite at the same time. Compare the answers side by side and keep the best one.