Gemini 3 Pro vs Gemini 3.8 Flash: Specs & Benchmark Comparison
Gemini 3 Pro and Gemini 3.8 Flash both come from Google, Gemini 3 Pro was released in November 2025, and Gemini 3.8 Flash followed 10 months later in September 2026.
We have 19 benchmark results for Gemini 3 Pro and 13 benchmark results for Gemini 3.8 Flash, but they overlap on a single test: CharXiv-R, where Gemini 3.8 Flash scores 86.2% against 81.4%.
Gemini 3.8 Flash is the cheaper API at $0.75 per million input tokens and $3.75 per million output tokens, roughly 3 times cheaper than Gemini 3 Pro at $2 and $12. Both accept a context window of about 1M tokens. Both accept text, images, audio, and video as input.
| Characteristic | Gemini 3 Pro | Gemini 3.8 Flash |
|---|---|---|
| Company | ||
| Release Date | November 17, 2025 | September 2, 2026 |
| Parameters | — | — |
| Multimodal | Yes | Yes |
| Context (input) | 1.0M | 1.0M |
| Context (output) | 66K | 66K |
| Input Price / 1M | $2.00 | $0.75 |
| Output Price / 1M | $12.00 | $3.75 |
| Average Score | 70.5% | 59.2% |
| Benchmarks | ||
| CharXiv-R | 81.4% | 86.2% |
Visual Benchmark Comparison
Verdict
Gemini 3.8 Flash leads in 2 out of 4 comparison categories.
Both models show comparable average scores: Gemini 3 Pro — 0.7, Gemini 3.8 Flash — 0.6.
Gemini 3.8 Flash is 3.1x cheaper: input $0.75/1M vs $2.00/1M tokens.
Same context size: 1M tokens.
Gemini 3.8 Flash is newer: released 9/2/2026 vs 11/17/2025.
More About These Models
Related Comparisons
Frequently Asked Questions
Which is better for coding — Gemini 3 Pro or Gemini 3.8 Flash?
Which model is cheaper — Gemini 3 Pro or Gemini 3.8 Flash?
Which has a larger context window — Gemini 3 Pro or Gemini 3.8 Flash?
The Gemini 3 Pro and Gemini 3.8 Flash comparison is updated for 2026. Data includes benchmark results, API pricing, context window size and other specifications. For more detailed information, visit the Gemini 3 Pro or Gemini 3.8 Flash page. See also the complete list of AI model comparisons.