Gemini 3.8 Flash vs GPT-6 Astra
API pricing, context window and capabilities for Gemini 3.8 Flash and GPT-6 Astra, side by side. Prices are the cheapest listed serving route per 1M tokens, from LiteLLM and OpenRouter.
Verdict
computed from the published numbersGemini 3.8 Flash wins on price. GPT-6 Astra wins on intelligence and on context window.
Price
Gemini 3.8 Flash
Terminal-Bench
Tied
Intelligence
GPT-6 Astra
Context window
GPT-6 Astra
Key takeaways
who wins on what, from the published numbersGemini 3.8 Flash wins
- Cheaper input ($0.75 vs $10.00 /1M)
- Cheaper output ($3.75 vs $50.00 /1M)
- Supports audio
GPT-6 Astra wins
- Larger context window (1M vs 1.1M)
- Higher max output (66K vs 128K)
Cheaper overall
Gemini 3.8 Flash
$0.75 + $3.75 /1M
Larger context
GPT-6 Astra
1.1M
More providers
Tied
Pricing & specs
cheapest listed route · per 1M tokensOn-demand listed rates, OpenRouter routed quotes and Vercel reseller quotes. Enterprise commitments can be materially lower.
| Gemini 3.8 Flash | GPT-6 Astra | |
|---|---|---|
| Input $/1M | $0.75via Google best | $10.00via OpenAI |
| Output $/1M | $3.75via Google best | $50.00via OpenAI |
| Context window | 1M | 1.1M best |
| Max output | 66K | 128K best |
| Serving providers | 5 | 5 |
| Date | Released Sep 2, 2026 | Released Sep 4, 2026 |
Benchmarks
Benchmark scores, side by side| Gemini 3.8 Flash | GPT-6 Astra | |
|---|---|---|
| Intelligence | 40.9 | 52.7 best |
| Terminal-Bench | 88% | 88% |
| GPQA Diamond | 95% | 96% best |
| Output speed | 145 t/s best | 61 t/s |
| Latency (TTFT) | 24.48s best | 280.05s |
Cost calculator
choose a serving route for each sideInput tokens / month
Output tokens / month
Gemini 3.8 Flash
via Vertex AI
$7.50
GPT-6 Astra
via OpenAI
$100
Capabilities
feature support, side by side| Feature | Gemini 3.8 Flash | GPT-6 Astra |
|---|---|---|
| Vision | ✓ | ✓ |
| Tool use | ✓ | ✓ |
| Reasoning | ✓ | ✓ |
| Audio | ✓ | — |
| Prompt caching | ✓ | ✓ |
| Structured output | ✓ | ✓ |
| Web search | ✓ | ✓ |
Related comparisons
Frequently asked questions
Which is cheaper, Gemini 3.8 Flash or GPT-6 Astra?
Gemini 3.8 Flash is cheaper for input ($0.75 vs $10.00 per 1M tokens) from Google. Gemini 3.8 Flash is cheaper for output ($3.75 vs $50.00 per 1M tokens) from Google.
What is the context window difference between Gemini 3.8 Flash and GPT-6 Astra?
Gemini 3.8 Flash has a 1M-token context window and GPT-6 Astra has 1.1M tokens, so GPT-6 Astra can take a larger prompt.
How do Gemini 3.8 Flash and GPT-6 Astra compare on benchmarks?
On the tracked benchmarks, they score about the same on Terminal-Bench, and GPT-6 Astra leads on intelligence.
Listed prices from LiteLLM, OpenRouter and Vercel · last checked Oct 14, 2026
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