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 1,350), while GPT-5.6 Terra leads in SWE-bench software engineering benchmarks (70.4%), while Gemini 2.5 Pro is more budget-friendly at $5/1M per 1M output tokens, while GPT-5.6 Terra provides faster response streaming (128 tok/s). 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
OpenAI 5.6 mid tier. Official API $2/$12 per 1M after the Jul 30 2026 price cut.
Currently comparing Gemini 2.5 Pro vs GPT-5.6 Terra. Alternative family tiers available.
Δ 198 Arena Elo pts
128 tok/s
$5 / 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 2.5 Pro | GPT-5.6 Terra | Advantage Delta |
|---|---|---|---|
| Preference Elo | +198 | ||
| Coding Elo | — | — | |
| LiveBench | +12% | ||
| SWE-bench | +6.6% | ||
| GPQA Diamond | +5.6% | ||
| Time to first token | +50 ms | ||
| Output speed | 95 tok/s | 128 tok/s | +33 tok/s |
| Input price | $1.25/1M | +$0.75/1M | |
| Output price | +$7/1M | ||
| Context window | +1M |
Simulate monthly production API costs in USD (US Dollar).
Gemini 2.5 Pro is estimated to save $131.25/month ($1,575/year).
Higher SWE-bench (70.4%).
Lower output list price ($5/1M).
Lower TTFT (160 ms).
Larger window (2M).
Both accept images. Defaulting to the higher-Elo side (GPT-5.6 Terra).
| Target Workload | Recommended Pick | Evaluation Rationale |
|---|---|---|
| Repo / coding agents | GPT-5.6 Terra | Higher SWE-bench (70.4%). |
| High-volume chat | Gemini 2.5 Pro | Lower output list price ($5/1M). |
| Voice / low-latency UI | GPT-5.6 Terra | Lower TTFT (160 ms). |
| Long-document RAG | Gemini 2.5 Pro | Larger window (2M). |
| 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.
2025-03 row. 3.x Pro replaced it. Kept for old “2.5 pro vs gpt-4o” inbound.
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Verified Head-to-Head Telemetry
