Gemini 3.8 Flash vs GPT-5.6 Sol
API pricing, context window and capabilities for Gemini 3.8 Flash and GPT-5.6 Sol, 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-5.6 Sol wins on Terminal-Bench, on intelligence and on context window.
Price
Gemini 3.8 Flash
Terminal-Bench
GPT-5.6 Sol
Intelligence
GPT-5.6 Sol
Context window
GPT-5.6 Sol
Key takeaways
who wins on what, from the published numbersGemini 3.8 Flash wins
- Cheaper input ($0.75 vs $2.00 /1M)
- Cheaper output ($3.75 vs $10.00 /1M)
- Supports audio
GPT-5.6 Sol wins
- Larger context window (1M vs 1.1M)
- Higher max output (66K vs 128K)
- More serving providers (5 vs 6)
Cheaper overall
Gemini 3.8 Flash
$0.75 + $3.75 /1M
Larger context
GPT-5.6 Sol
1.1M
More providers
GPT-5.6 Sol
6 providers
Pricing & specs
cheapest listed route · per 1M tokensOn-demand listed rates, OpenRouter routed quotes and Vercel reseller quotes. Enterprise commitments can be materially lower. An OpenRouter routed quote is the price of whichever upstream provider OpenRouter prefers today, so it moves day to day.
| Gemini 3.8 Flash | GPT-5.6 Sol | |
|---|---|---|
| Input $/1M | $0.75via Google best | $2.00OpenRouter routed quote |
| Output $/1M | $3.75via Google best | $10.00OpenRouter routed quote |
| Context window | 1M | 1.1M best |
| Max output | 66K | 128K best |
| Serving providers | 5 | 6 best |
| Date | Released Sep 2, 2026 | Released Jul 9, 2026 |
Benchmarks
Benchmark scores, side by side| Gemini 3.8 Flash | GPT-5.6 Sol | |
|---|---|---|
| Intelligence | 40.9 | 47.0 best |
| Terminal-Bench | 88% | 90% best |
| GPQA Diamond | 95% best | 94% |
| Output speed | 145 t/s best | 94 t/s |
| Latency (TTFT) | 24.48s best | 138.40s |
Cost calculator
choose a serving route for each sideInput tokens / month
Output tokens / month
Gemini 3.8 Flash
via Vertex AI
$7.50
GPT-5.6 Sol
via OpenRouter
$20
Capabilities
feature support, side by side| Feature | Gemini 3.8 Flash | GPT-5.6 Sol |
|---|---|---|
| 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-5.6 Sol?
Gemini 3.8 Flash is cheaper for input ($0.75 vs $2.00 per 1M tokens) from Google. Gemini 3.8 Flash is cheaper for output ($3.75 vs $10.00 per 1M tokens) from Google.
What is the context window difference between Gemini 3.8 Flash and GPT-5.6 Sol?
Gemini 3.8 Flash has a 1M-token context window and GPT-5.6 Sol has 1.1M tokens, so GPT-5.6 Sol can take a larger prompt.
How do Gemini 3.8 Flash and GPT-5.6 Sol compare on benchmarks?
On the tracked benchmarks, GPT-5.6 Sol leads on Terminal-Bench, and GPT-5.6 Sol leads on intelligence.
Listed prices from LiteLLM, OpenRouter and Vercel · last checked Oct 14, 2026
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