Gemini 3.8 FlashvsGPT-5.6 Terra
Gemini 3.8 Flash and GPT-5.6 Terra are tied across 4 shared benchmarks: Gemini 3.8 Flash leads on 2, GPT-5.6 Terra leads on 2, with 0 ties and an average score difference of -4.23.
Gemini 3.8 Flash
Google Deep Mind · 2026-09-02 · Multimodal model
GPT-5.6 Terra
OpenAI · 2026-06-26 · Reasoning model
Gemini 3.8 Flash2 wins(50%)(50%)2 winsGPT-5.6 Terra
Benchmark scores
Grouped by capability, sorted by largest gap within each. 4 shared benchmarks.
AI Agent - Tool Usage
Even 2/2| Benchmark | Gemini 3.8 Flash | GPT-5.6 Terra | Diff |
|---|---|---|---|
| Terminal-Bench 4.0 | 19.109 / 12Thinking (With Tools) | 21.527 / 12Max (With Tools) | -2.42 |
| Terminal-Bench 2.1 | 89.401 / 48Thinking (With Tools) | 87.408 / 48最高（无工具） | +2 |
Coding and Software Engineer
Gemini 3.8 Flash 1/1| Benchmark | Gemini 3.8 Flash | GPT-5.6 Terra | Diff |
|---|---|---|---|
| DeepSWE | 73.701 / 33Thinking (With Tools) | 69.604 / 33极高强度思考（工具） | +4.10 |
Productivity Knowledge
GPT-5.6 Terra 1/1| Benchmark | Gemini 3.8 Flash | GPT-5.6 Terra | Diff |
|---|---|---|---|
| GDPval-AA v2 | 1,54513 / 24Thinking (No Tools) | 1,56611 / 24Max (With Tools) | -20.62 |
Specs
| Field | Gemini 3.8 Flash | GPT-5.6 Terra |
|---|---|---|
| Publisher | Google Deep Mind | OpenAI |
| Release date | 2026-09-02 | 2026-06-26 |
| Model type | Multimodal model | Reasoning model |
| Architecture | Dense | Dense |
| Parameters | Not available | Not available |
| Context length | 1M | 1.05M |
| Max output | 64K | 128K |
API pricing
Prices use DataLearner records when available; missing fields are not inferred.
| Item | Gemini 3.8 Flash | GPT-5.6 Terra |
|---|---|---|
| Text input | $0.75 / 1M tokens | $2 / 1M tokens |
| Text output | $3.75 / 1M tokens | $12 / 1M tokens |
| Cache read | $0.075 / 1M tokens | $0.2 / 1M tokens |
| Cache write | Not public | $2.5 / 1M tokens |
Summary
- Gemini 3.8 Flashleads in:Coding and Software Engineer (1/1)
- GPT-5.6 Terraleads in:Productivity Knowledge (1/1)
- Tied in:AI Agent - Tool Usage
On average across the 4 shared benchmarks, GPT-5.6 Terra scores 4.23 higher.
Largest single-benchmark gap: GDPval-AA v2 — Gemini 3.8 Flash 1,545 vs GPT-5.6 Terra 1,566 (-20.62).
Page generated from structured model, pricing and benchmark records. No real-time LLM is used to write the prose.