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Gemini 3.6 Flash vs GPT-5.6 Terra — Price, Context, and Capability Compared

Verdict

GPT-5.6 Terra costs 1.3× more per blended million tokens than Gemini 3.6 Flash. Gemini 3.6 Flash has the larger context window (1,000,000 tokens). Default to Gemini 3.6 Flash unless you specifically need GPT-5.6 Terra's edge.

Spec comparison

Gemini 3.6 FlashGPT-5.6 Terra
Price (input)$1.50/M$2.00/M
Price (output)$9.00/M$12.00/M
Blended price$3.38/M$4.50/M
Context window1,000,000 tokens400,000 tokens
Max output64,000 tokens128,000 tokens
Modalitiestext, vision, audiotext, vision
Reasoning modeYesYes
Released2026-062026-06
Speed114 t/s78 t/s

Cost at scale (3:1 blended)

Tokens / monthGemini 3.6 FlashGPT-5.6 TerraDelta
1,000,000$3.38$4.50$1.13 (1.3×)
10,000,000$33.75$45.00$11.25 (1.3×)
100,000,000$337.50$450.00$112.50 (1.3×)

Choose Gemini 3.6 Flash if…

  • Faster than Gemini 3.5 Flash
  • Top-tier coding and agentic performance for its price
  • 1M-token context
  • Latency-sensitive coding and agentic tasks that still need a huge context window.

Choose GPT-5.6 Terra if…

  • Balanced cost-to-intelligence ratio
  • Reasoning mode available on demand
  • Same 400K context as Sol
  • Everyday production workloads that need strong quality without Sol-tier pricing.

Run this exact matchup right now

Send the same prompt to Gemini 3.6 Flash and GPT-5.6 Terra side by side and see the outputs yourself.

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FAQ

Is Gemini 3.6 Flash cheaper than GPT-5.6 Terra?

Gemini 3.6 Flash is cheaper, at $3.38 per million blended tokens vs $4.50 for GPT-5.6 Terra.

Which has the bigger context window, Gemini 3.6 Flash or GPT-5.6 Terra?

Gemini 3.6 Flash has the larger context window: 1,000,000 tokens vs 400,000.

Can Gemini 3.6 Flash replace GPT-5.6 Terra for coding?

Both are viable for coding. Faster than Gemini 3.5 Flash (Gemini 3.6 Flash) vs Balanced cost-to-intelligence ratio (GPT-5.6 Terra) — pick based on which strength matters more for your workload.

Which is faster, Gemini 3.6 Flash or GPT-5.6 Terra?

Gemini 3.6 Flash is faster: 114 t/s vs 78 t/s, measured on our speed benchmarks.

Related

Gemini 3.6 Flash pricingGPT-5.6 Terra pricingvs Claude Opus 4.8vs Grok 4.3vs Gemini 2.5 Flashvs Gemini 3.1 ProPremium model tests

Pricing verified 2026-07-22. Specs verified 2026-08-08.