Gemini 3 Flash vs GPT-5.6 Terra
Gemini 3 Flash and GPT-5.6 Terra are both current production-tier models. Gemini 3 Flash is meaningfully cheaper at $0.50 / $3 per 1M. Gemini 3 Flash leads on long-context retrieval. GPT-5.6 Terra leads on coding, reasoning, general knowledge.
Specs side by side
| Metric | Google Gemini 3 Flash | OpenAI GPT-5.6 Terra |
|---|---|---|
| Input price (per 1M) | $0.5 | $2.5 |
| Output price (per 1M) | $3 | $15 |
| Context window | 1M tokens | 1.1M tokens |
| Speed tier | fast | balanced |
| Open weights | No | No |
| EU region | Yes | Yes |
| Free tier | Google AI Studio | No |
| Prompt caching | Yes | Yes |
| Vision input | Yes | Yes |
| Extended thinking | Yes | Yes |
When to choose each
Choose Gemini 3 Flash if…
- Cost is a priority ($0.50 / $3 per 1M vs $2.5 / $15 per 1M)
- You want a free tier for prototyping
- Long-context retrieval is central to your workload
Choose GPT-5.6 Terra if…
- Coding is central to your workload
- Reasoning is central to your workload
Benchmark delta
Gemini 3 Flash leads on
- Long-context retrieval
GPT-5.6 Terra leads on
- Coding
- Reasoning
- General knowledge
- Instruction following
- Tool use
FAQ — Gemini 3 Flash vs GPT-5.6 Terra
Gemini 3 Flash vs GPT-5.6 Terra — which is better?
Gemini 3 Flash and GPT-5.6 Terra are both current production-tier models. Gemini 3 Flash is meaningfully cheaper at $0.50 / $3 per 1M. Gemini 3 Flash leads on long-context retrieval. GPT-5.6 Terra leads on coding, reasoning, general knowledge. The right pick depends on your use case — see "When to choose each" above for a data-driven decision.
How does Gemini 3 Flash pricing compare to GPT-5.6 Terra?
Gemini 3 Flash costs $0.50 / $3 per 1M vs GPT-5.6 Terra at $2.5 / $15 per 1M. Gemini 3 Flash is cheaper on output tokens by roughly 400%. Both support prompt caching, which reduces effective cost by 80-90% on repeat system prompts.
Does Gemini 3 Flash or GPT-5.6 Terra have the bigger context window?
GPT-5.6 Terra has a 1.1M-token context window — 1× the 1M context of Gemini 3 Flash. Enough for entire codebases, books, or multi-document RAG.
Is there a free tier for Gemini 3 Flash or GPT-5.6 Terra?
Gemini 3 Flash: yes — Reduced daily quota; rate-limited for prototyping. GPT-5.6 Terra: no — Free $5 credit for new accounts; paid thereafter.
Which is better for coding — Gemini 3 Flash or GPT-5.6 Terra?
GPT-5.6 Terra leads on coding benchmarks (Gemini 3 Flash: 84/100, GPT-5.6 Terra: 93/100). For production coding agents also weigh tool-use performance — Gemini 3 Flash scores 85, GPT-5.6 Terra scores 93.