GPT-6.1 Terra vs Gemini 3.8 Flash
How OpenAI's GPT-6.1 Terra and Google AI's Gemini 3.8 Flash differ on paper, from the specs each provider publishes.
Compare them on your promptBoth answer side by side, free with your own API keys.
Key differences
- GPT-6.1 Terra accepts a larger context window: 1.05M tokens versus 1.05M for Gemini 3.8 Flash.
- GPT-6.1 Terra can write longer replies, up to 128K output tokens against 66K.
- GPT-6.1 Terra is the newer release (October 2026); Gemini 3.8 Flash came out in September 2026.
- GPT-6.1 Terra lists extended thinking support that Gemini 3.8 Flash does not.
Side by side
| Spec | GPT-6.1 Terra | Gemini 3.8 Flash |
|---|---|---|
| Provider | OpenAI | Google AI |
| Released | October 2026 | September 2026 |
| Context window | 1.05M tokens | 1.05M tokens |
| Max output | 128K tokens | 66K tokens |
| Reasoning model | Yes | Yes |
| Price per 1M tokens (in / out) | See provider | See provider |
| Capabilities | Image input, Reasoning, Coding, Tool calling, Structured output, Extended thinking, Streaming | Image input, Reasoning, Coding, Tool calling, Structured output, Streaming |
Specs as published by each provider. Benchmarks and output quality aren't covered here; the best test is your own prompts.
Specs only go so far. Ask both.
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