GPT-6.1 Terra vs DeepSeek V4 Flash
How OpenAI's GPT-6.1 Terra and DeepSeek's DeepSeek V4 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 1M for DeepSeek V4 Flash.
- DeepSeek V4 Flash can write longer replies, up to 384K output tokens against 128K.
- GPT-6.1 Terra is the newer release (October 2026); DeepSeek V4 Flash came out in July 2026.
- GPT-6.1 Terra lists image input support that DeepSeek V4 Flash does not.
Side by side
| Spec | GPT-6.1 Terra | DeepSeek V4 Flash |
|---|---|---|
| Provider | OpenAI | DeepSeek |
| Released | October 2026 | July 2026 |
| Context window | 1.05M tokens | 1M tokens |
| Max output | 128K tokens | 384K 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 | Reasoning, Coding, Tool calling, Structured output, Extended thinking, 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.
Send one message and get GPT-6.1 Terra and DeepSeek V4 Flash's answers side by side, with response time, tokens and cost for each. You'll need OpenAI and DeepSeek keys.
Open GPT-6.1 Terra vs DeepSeek V4 Flash