Pairwise benchmark snapshot · Aug 17, 2026
In this head-to-head showdown, Gemini 2.5 Pro delivers higher overall intelligence and human-preferred responses (Elo 1,350 vs 1,335), while Gemini 2.5 Pro leads in SWE-bench software engineering benchmarks (63.8%), while Gemini 2.5 Pro is more budget-friendly at $10/1M per 1M output tokens, while GPT-4o provides faster response streaming (110 tok/s). Review the complete breakdown below to determine which model best fits your performance and budget requirements.
8 benchmarks evaluated across capability, speed, and cost
Previous Google long-context flagship.
Previous OpenAI flagship. Still a common compare baseline on legacy pages.
Δ 15 Arena Elo pts
110 tok/s
$10 / 1M output
Relative percentile scores computed across all active models in the benchmark catalog.
Comparing top standard models across 6 key capability 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-4o | Advantage Delta |
|---|---|---|---|
| Preference Elo | +15 | ||
| LiveBench | +2.9% | ||
| SWE-bench | +9% | ||
| GPQA Diamond | +3.2% | ||
| Time to first token | +30 ms | ||
| Output speed | 95 tok/s | 110 tok/s | +15 tok/s |
| Input price | $1.25/1M | $2.5/1M | +$1.25/1M |
| Output price | — | ||
| Context window | +921k |
Simulate monthly production API costs in USD (US Dollar).
Gemini 2.5 Pro is estimated to save $43.75/month ($525/year).
Higher SWE-bench (63.8%).
Lower output list price ($10/1M).
Lower TTFT (180 ms).
Larger window (1M).
Both accept images. Defaulting to the higher-Elo side (Gemini 2.5 Pro).
| Target Workload | Recommended Pick | Evaluation Rationale |
|---|---|---|
| Repo / coding agents | Gemini 2.5 Pro | Higher SWE-bench (63.8%). |
| High-volume chat | Gemini 2.5 Pro | Lower output list price ($10/1M). |
| Voice / low-latency UI | GPT-4o | Lower TTFT (180 ms). |
| Long-document RAG | Gemini 2.5 Pro | Larger window (1M). |
| Screenshots / vision | Gemini 2.5 Pro | Both accept images. Defaulting to the higher-Elo side (Gemini 2.5 Pro). |
2025-03 row. 3.x Pro replaced it. Kept for old “2.5 pro vs gpt-4o” inbound.
Deprecated for buying. Kept because “4o vs sonnet” is still a typed query.
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Verified Head-to-Head Telemetry
