Gemini 3.8 Flash vs GPT-6 Sol
Gemini 3.8 Flash costs $0.75 / $3.75 and GPT-6 Sol costs $2.00 / $10.00 per million input / output tokens. At a typical 3:1 mix, Gemini 3.8 Flash is 2.7× cheaper than GPT-6 Sol.
Input
$0.75
per 1M
Output
$3.75
per 1M
Cached
$0.075
1M context
GPT-6 Sol
OpenAI
Input
$2.00
per 1M
Output
$10.00
per 1M
Cached
$0.20
1.05M context
Side by side
Green marks the cheaper price, larger context window, bigger discount or higher score.
| Detail | Gemini 3.8 Flash | GPT-6 Sol |
|---|---|---|
| Input per 1M | $0.75 | $2.00 |
| Output per 1M | $3.75 | $10.00 |
| Blended per 1M (3:1) | $1.50 | $4.00 |
| Cached input per 1M | $0.075 | $0.20 |
| Batch or off-peak discount | 50% (batch) | 50% (batch) |
| Long prompts | Same rate at any length | Over 272K: 2× in, 1.5× out |
| Context window | 1M | 1.05M |
| Released | 2 Sep 2026 | 22 Sep 2026 |
| Open weights | No | No |
| Arena text score | 1492 | — |
| Verified | 27 Sep 2026 | 27 Sep 2026 |
Sources: Gemini API pricing and OpenAI pricing.
Monthly cost on three workloads
List prices, no batch discount. The cached share applies where a model has a cache rate.
| Workload | Gemini 3.8 Flash | GPT-6 Sol | Difference |
|---|---|---|---|
| Customer chat assistant50,000 conversations a month, about 2,000 tokens in and 400 out each; 50% cached | $116 | $310 | $194 |
| Document Q&A (RAG)20,000 questions a month over retrieved documents, 12,000 in and 600 out; 30% cached | $176 | $470 | $294 |
| Coding agent400 tasks a month, 40 steps each with a growing context; 85% cached | $162 | $433 | $270 |
How they differ
- Gemini 3.8 Flash is cheaper on input ($0.75 vs $2).
- Gemini 3.8 Flash is cheaper on output ($3.75 vs $10), which matters most for long answers and reasoning models.
- GPT-6 Sol accepts longer prompts (1.05M vs 1M tokens).
- Cached input is cheaper on Gemini 3.8 Flash ($0.075 vs $0.20), which favours agents and chat apps that resend the same context.
Recent changes
All changes- OpenAI launched GPT-6 Sol at $2 / $10 and GPT-6 Luna at $0.10 / $0.50.
- OpenAI launched GPT-6 Astra at $10 / $50, its most expensive standard model.
- Google launched Gemini 3.8 Flash at $0.75 / $3.75 until 31 December, then $1.50 / $7.50.
- Google launched Gemini 3.7 Flash at $0.75 / $3.75.
- ▼ 50%Google launched Gemini 3.6 Flash at $0.75 / $3.75, half the price of 3.5 Flash, and Gemini 3.5 Flash-Lite at $0.30 / $2.50.
Related comparisons
Compare any two
Claude Opus 5.5 vs GPT-6 Sol$4.00 / $20.00 · $2.00 / $10.00- Claude Sonnet 5 vs GPT-6 Sol$2.00 / $10.00 · $2.00 / $10.00
- Gemini 3.8 Flash vs Claude Haiku 4.5$0.75 / $3.75 · $1.00 / $5.00
Grok 4.7 vs GPT-6 Sol$2.00 / $6.00 · $2.00 / $10.00
Qwen3.8 Max vs GPT-6 Sol$2.00 / $6.00 · $2.00 / $10.00- Claude Sonnet 5 vs Gemini 3.8 Flash$2.00 / $10.00 · $0.75 / $3.75
Muse Spark 1.3 vs GPT-6 Sol$1.25 / $4.25 · $2.00 / $10.00