Gemini 3.8 Flash vs GPT-6 Astra
Gemini 3.8 Flash (Google) vs GPT-6 Astra (OpenAI), compared on price, context, speed and Arabic support. Both run on thalam through one OpenAI-compatible API, so you can switch between them with a single model id change. At a glance, Gemini 3.8 Flash is the cheaper option and Gemini 3.8 Flash is rated faster.
Specs side by side
| Spec | Gemini 3.8 Flash | GPT-6 Astra |
|---|---|---|
| Provider | OpenAI | |
| Type | Text | Text |
| Context window | 1M | 1M |
| Max output | 64K | 128K |
| Input price | $1.50 / 1M | $10.00 / 1M |
| Output price | $7.50 / 1M | $50.00 / 1M |
| Speed | Fast | Medium |
| Arabic support | Strong | Strong |
Which should you choose?
- Lower cost, about 6.7× cheaper ($1.50 / 1M)
- Rated faster (Fast) for latency-sensitive workloads
- OpenAI's GPT-6 generation. Frontier reasoning with a 1M-token context, image input, and adjustable reasoning effort
One OpenAI-compatible endpoint, one bill. Switch between them with a single model id change, pay per use, credits never expire.
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FAQ
What's the difference between Gemini 3.8 Flash and GPT-6 Astra?
Gemini 3.8 Flash costs less ($1.50 / 1M vs $10.00 / 1M); Gemini 3.8 Flash is rated faster. Both are available on thalam behind one OpenAI-compatible API.
Is Gemini 3.8 Flash or GPT-6 Astra cheaper?
Gemini 3.8 Flash is cheaper on input ($1.50 / 1M vs $10.00 / 1M). On thalam you pay per use, so you can route cheap-by-default and fall back to the other only when needed.
Can I use both Gemini 3.8 Flash and GPT-6 Astra with one API key?
Yes. thalam is OpenAI-compatible, so both models are reachable through the same endpoint. Switching between them is a one-line model id change, no code rewrite.