AI Models · Paid vs Paid

GPT-5.6 Terra Paid vs Gemini 3.5 Flash Paid

GPT-5.6 Terra vs Gemini 3.5 Flash compared — price per token, context window, multimodality, openness and which to choose. Full 2026 breakdown.

GPT-5.6 Terra — full profile ›  ·  Gemini 3.5 Flash — full profile ›

Prices & specs refreshed from live data · OpenSourceAI.tech

Open-model prices = cheapest provider via OpenRouter; official maker rates may be higher.

Choose Gemini 3.5 Flash for the lower output price ($9/M vs $15/M). Choose GPT-5.6 Terra if you need the larger 1.1M context window.

GPT-5.6 Terra vs Gemini 3.5 Flash specs

SpecGPT-5.6 TerraGemini 3.5 Flash
MakerOpenAIGoogle
TypeProprietaryProprietary
Context window1.1M tokens1M tokens
Input price$2.5/M$1.5/M
Output price$15/M$9/M
Vision / multimodalYesYes
Tool / function callingYesYes
Self-hostableNo (API only)No (API only)
LicenseProprietaryProprietary

Feature comparison

CapabilityGPT-5.6 TerraGemini 3.5 Flash
Open weights (downloadable)✗✗
Self-hostable✗✗
Runs fully offline✗✗
Vision / multimodal✓✓
Tool / function calling✓✓
1M+ context window✓✓

Benchmarks: GPT-5.6 Terra vs Gemini 3.5 Flash

Independent benchmark scores measured by Artificial Analysis. Higher is better (except latency).

GPT-5.6 Terra
Gemini 3.5 Flash
Intelligence index
55
50.2
Coding index
76.7
70.1
GPQA
92.5%
92.2%
Humanity's Last Exam
41.8%
41%
Long Context Reasoning
74%
69.3%
SciCode
53.9%
53.1%
IFBench
71.2%
76.3%
τ²-Bench
86.3%
95.3%
τ-Bench Banking
31.8%
25.4%
Terminal-Bench
88%
78.7%
Terminal-Bench Hard
57.6%
40.9%
Speed
153.9 tok/s
293.7 tok/s
Latency
102.59s
12.74s
Intelligence per $
9.8
14.9

Benchmark data by Artificial Analysis.

How GPT-5.6 Terra and Gemini 3.5 Flash score

🤝 Neck and neck on these criteria (3.1 vs 3.2 / 5).
CriterionGPT-5.6 TerraGemini 3.5 Flash
Cost-efficiency3.03.5
Context window5.05.0
Openness1.51.5
Self-hosting1.01.0
Multimodality5.05.0

Scores come from live data — output price (cost), context length, open vs closed weights (openness & self-hosting) and vision/tool support (multimodality). Raw task quality isn't scored here; it depends on your benchmark — see the verdict.

What each model is

GPT-5.6 Terra Paid

OpenAI · Proprietary

GPT-5.6 Terra is a balanced model in OpenAI's GPT-5.6 series, positioned between the flagship Sol tier and the cost-efficient Luna tier. It is suited for everyday coding, reasoning, and agentic...

Gemini 3.5 Flash Paid

Google · Proprietary

Gemini 3.5 Flash is Google's high-efficiency multimodal model, bringing near-Pro level coding and reasoning at Flash-tier cost and speed. It is highly optimized for coding proficiency and parallel agentic execution...

Other models in these families

These variants are tracked but not compared here — one page per family keeps the comparison readable.

Other variants tracked
Gemini 3 Flash PreviewGemini 2.5 Flash

Frequently asked questions

GPT-5.6 Terra vs Gemini 3.5 Flash — which is cheaper?

Gemini 3.5 Flash is cheaper on output ($9/M vs $15/M).

Which has the larger context window?

GPT-5.6 Terra offers the larger context window (1.1M tokens).

GPT-5.6 Terra vs Gemini 3.5 Flash — which should I pick in 2026?

Choose Gemini 3.5 Flash for the lower output price ($9/M vs $15/M). Choose GPT-5.6 Terra if you need the larger 1.1M context window.

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