token.app › Compare › Gemini 3.5 Flash vs GPT-5.6 Terra
Gemini 3.5 Flash vs GPT-5.6 Terra
GPT-5.6 Terra leads on 4 of 5 shared benchmarks. GPT-5.6 Terra is 1.5× cheaper per token on a blended 3:1 basis. GPT-5.6 Terra accepts the larger context window (1.1M).
Head to head
Blended price uses a 3:1 input:output mix
| Gemini 3.5 Flash | GPT-5.6 Terra | |
|---|---|---|
| Provider | OpenAI | |
| Input $/1M | $1.50 | $1.00 |
| Output $/1M | $9.00 | $6.00 |
| Blended $/1M | $3.38 | $2.25 |
| Context window | 1.0M | 1.1M |
| Max output | 66K | 128K |
| Released | May 2026 | Jul 2026 |
| Licence | Proprietary | Proprietary |
| GPQA Diamond | 92.8% | 93.3% |
| FrontierMath T1–3 | 62.8% | 86.0% |
| FrontierMath T4 | 26.8% | 70.7% |
| SimpleQA Verified | 68.4% | 43.1% |
| OTIS Mock AIME | 95.6% | 99.7% |
Benchmark scores independently run and published by Epoch AI, 'AI Benchmarking Hub', used under CC BY 4.0. Only benchmarks with a score for BOTH models are compared.
Choose Gemini 3.5 Flash if…
- Higher SimpleQA Verified (68.4% vs 43.1%)
Choose GPT-5.6 Terra if…
- Costs less per token — $2.25 vs $3.38 blended
- Higher GPQA Diamond (93.3% vs 92.8%)
- Higher FrontierMath T1–3 (86.0% vs 62.8%)
- Higher FrontierMath T4 (70.7% vs 26.8%)
- Higher OTIS Mock AIME (99.7% vs 95.6%)
- Larger context window (1.1M)
- Newer model (released Jul 2026)
FAQ
Which is better, Gemini 3.5 Flash or GPT-5.6 Terra?
Across the 5 benchmarks both models have independently-run scores for, Gemini 3.5 Flash leads on 1 and GPT-5.6 Terra leads on 4. Benchmarks are one input — price and context window are on this page too.
Is Gemini 3.5 Flash cheaper than GPT-5.6 Terra?
GPT-5.6 Terra is cheaper: $2.25 versus $3.38 per million tokens blended at 3:1 input:output. Input alone: $1.50 vs $1.00. Output alone: $9.00 vs $6.00.
What context windows do Gemini 3.5 Flash and GPT-5.6 Terra have?
Gemini 3.5 Flash: 1,048,576 tokens. GPT-5.6 Terra: 1,050,000 tokens.
Who makes Gemini 3.5 Flash and GPT-5.6 Terra?
Gemini 3.5 Flash is made by Google. GPT-5.6 Terra is made by OpenAI.
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