Pairwise benchmark snapshot · Aug 16, 2026
In this head-to-head showdown, GPT-5.6 Terra delivers higher overall intelligence and human-preferred responses (Elo 1,548 vs 1,495), while Gemini 3 Flash leads in SWE-bench software engineering benchmarks (75.8%), while Gemini 3 Flash is more budget-friendly at $0.6/1M per 1M output tokens. Review the complete breakdown below to determine which model best fits your performance and budget requirements.
9 direct benchmark disciplines evaluated across capability, speed, and cost
Fast Google frontier-adjacent model. Near-top official SWE-bench at a fraction of Opus price.
OpenAI 5.6 mid tier. Official API $2/$12 per 1M after the Jul 30 2026 price cut.
Currently comparing Gemini 3 Flash vs GPT-5.6 Terra. Alternative family tiers available.
Δ 53 Arena Elo pts
190 tok/s
$0.6 / 1M output
Relative percentile scores computed across all active models in the benchmark catalog.
Comparing top Western standard models with China's leading frontier rival across 6 skill dimensions. Tap any spoke or dot to inspect.
Category wins across reasoning intelligence, generation speed, and token cost.
Preference Elo, Coding proficiency, SWE-bench & LiveBench accuracy
Generation throughput and time to first token responsiveness
Cost per million tokens and max context window length
| Benchmark | Gemini 3 Flash | GPT-5.6 Terra | Advantage Delta |
|---|---|---|---|
| Preference Elo | +53 | ||
| Coding Elo | +32 | ||
| LiveBench | +2.3% | ||
| SWE-bench | +5.4% | ||
| GPQA Diamond | +3.6% | ||
| Time to first token | +65 ms | ||
| Output speed | 190 tok/s | 128 tok/s | +62 tok/s |
| Input price | $0.15/1M | +$1.85/1M | |
| Output price | $0.6/1M | +$11.4/1M | |
| Context window | — |
Simulate monthly production API costs in USD (US Dollar).
Gemini 3 Flash is estimated to save $235.75/month ($2,829/year).
Higher SWE-bench (75.8%).
Lower output list price ($0.6/1M).
Lower TTFT (95 ms).
Larger window (1M).
Both accept images. Defaulting to the higher-Elo side (GPT-5.6 Terra).
| Target Workload | Recommended Pick | Evaluation Rationale |
|---|---|---|
| Repo / coding agents | Gemini 3 Flash | Higher SWE-bench (75.8%). |
| High-volume chat | Gemini 3 Flash | Lower output list price ($0.6/1M). |
| Voice / low-latency UI | Gemini 3 Flash | Lower TTFT (95 ms). |
| Long-document RAG | Gemini 3 Flash | Larger window (1M). |
| Screenshots / vision | GPT-5.6 Terra | Both accept images. Defaulting to the higher-Elo side (GPT-5.6 Terra). |
Terra is OpenAI’s Sonnet-class invoice. Use it when Sol is too expensive and Luna is too small.
March 2026 speed SKU. Still a useful cheap-coding compare even after 3.6/3.7 Flash.
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