Pairwise benchmark snapshot · Aug 17, 2026noindex (thin pair)
This page compares Google: Gemini 3.1 Pro Preview Custom Tools (Google) and GPT-5 (OpenAI) using the latest snapshots we have as of Aug 17, 2026. GPT-5 wins on output price at $10/1M. Google: Gemini 3.1 Pro Preview Custom Tools has the larger context window (1M tokens). Every cell below is a dated snapshot from a named public source — we do not invent missing scores, and we do not run SWE-bench ourselves.
Auto-discovered from OpenRouter (google/gemini-3.1-pro-preview-customtools). Preview until a second source matches.
OpenAI
GPT-5OpenAI flagship reasoning model for 2025–26. Strong general preference Elo and multimodal coverage.
Instant pairwise benchmark recalculation across 400+ LLMs
Category wins across intelligence, speed, and pricing efficiency.
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
Each spoke is a skill. Farther from the center is better (0–100th percentile). Tap any dot to inspect details.
No shared data
No shared data
$2.00/1M cheaper
Simulate monthly production API costs based on published $/1M tokens.
GPT-5 is estimated to save $56.25/month ($675/year).
Need SWE-bench on both sides.
Lower output list price ($10/1M).
Need TTFT on both sides.
Larger window (1M).
GPT-5 is the side marked multimodal in the catalog.
| Target Workload | Recommended Pick | Evaluation Rationale |
|---|---|---|
| Repo / coding agents | insufficient data | Need SWE-bench on both sides. |
| High-volume chat | GPT-5 | Lower output list price ($10/1M). |
| Voice / low-latency UI | insufficient data | Need TTFT on both sides. |
| Long-document RAG | Google: Gemini 3.1 Pro Preview Custom Tools | Larger window (1M). |
| Screenshots / vision | GPT-5 | GPT-5 is the side marked multimodal in the catalog. |
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The real PNG is generated at /compare/gemini-3-1-pro-preview-customtools-vs-gpt-5/opengraph-image for crawlers.
Verified head-to-head card
