Pairwise benchmark snapshot · Aug 17, 2026
In this head-to-head showdown, GPT-5 delivers higher overall intelligence and human-preferred responses (Elo 1,558 vs 1,350), while GPT-5 leads in SWE-bench software engineering benchmarks (68.4%), while Gemini 2.5 Pro is more budget-friendly at $10/1M per 1M output tokens. Review the complete breakdown below to determine which model best fits your performance and budget requirements.
OpenAI flagship reasoning model for 2025–26. Strong general preference Elo and multimodal coverage.
Simulate accuracy gains vs added response time & token cost
Reasoning models “think before answering” by generating internal reasoning tokens. Higher effort improves math, coding, and logic accuracy, but increases response delay and token costs.
Δ 208 Arena Elo pts
95 tok/s
$10 / 1M output
Relative percentile scores computed across all active models in the benchmark catalog.
Each spoke is a skill. Farther from the center is better (0–100th percentile). Tap any dot to inspect details.
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 | Advantage Delta |
|---|---|---|---|
| Preference Elo | GPT-5 (+208) | ||
| Coding Elo | — | — | |
| LiveBench | GPT-5 (+12.7%) | ||
| SWE-bench | GPT-5 (+4.6%) | ||
| GPQA Diamond | GPT-5 (+8.8%) | ||
| Time to first token | Gemini 2.5 Pro (+80 ms) | ||
| Output speed | 95 tok/s | 78 tok/s | Gemini 2.5 Pro (+17 tok/s) |
| Input price | $1.25/1M | $1.25/1M | — |
| Output price | — | ||
| Context window | Gemini 2.5 Pro (+649k) |
Simulate monthly production API costs in USD (US Dollar).
Higher SWE-bench (68.4%).
Lower output list price ($10/1M).
Lower TTFT (210 ms).
Larger window (1M).
Both accept images. Defaulting to the higher-Elo side (GPT-5).
| Target Workload | Recommended Pick | Evaluation Rationale |
|---|---|---|
| Repo / coding agents | GPT-5 | Higher SWE-bench (68.4%). |
| High-volume chat | Gemini 2.5 Pro | Lower output list price ($10/1M). |
| Voice / low-latency UI | Gemini 2.5 Pro | Lower TTFT (210 ms). |
| Long-document RAG | Gemini 2.5 Pro | Larger window (1M). |
| Screenshots / vision | GPT-5 | Both accept images. Defaulting to the higher-Elo side (GPT-5). |
Still a common compare target. 5.6 Sol replaced it as the buy; GPT-5 stays for old URLs.
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 card
