Pairwise benchmark snapshot · Aug 17, 2026
In this head-to-head showdown, OpenAI o1-mini delivers higher overall intelligence and human-preferred responses (Elo 1,445 vs 1,295), while OpenAI o1-mini leads in SWE-bench software engineering benchmarks (56.4%), while Gemini 2.5 Flash is more budget-friendly at $2.5/1M 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
Previous Google speed workhorse.
OpenAI high-speed, cost-effective reasoning model optimized for STEM, math, and code generation.
Currently comparing Gemini 2.5 Flash vs OpenAI o1-mini. Alternative family tiers available.
Δ 150 Arena Elo pts
185 tok/s
$2.5 / 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 Flash | OpenAI o1-mini | Advantage Delta |
|---|---|---|---|
| Preference Elo | +150 | ||
| Coding Elo | — | — | |
| LiveBench | +10.6% | ||
| SWE-bench | +8.4% | ||
| GPQA Diamond | +8.6% | ||
| Time to first token | +170 ms | ||
| Output speed | 185 tok/s | 85 tok/s | +100 tok/s |
| Input price | $0.3/1M | $1.1/1M | +$0.8/1M |
| Output price | $2.5/1M | $4.4/1M | +$1.9/1M |
| Context window | +921k |
Simulate monthly production API costs in USD (US Dollar).
Gemini 2.5 Flash is estimated to save $56.50/month ($678/year).
Higher SWE-bench (56.4%).
Lower output list price ($2.5/1M).
Lower TTFT (110 ms).
Larger window (1M).
Gemini 2.5 Flash is the side marked multimodal in the catalog.
| Target Workload | Recommended Pick | Evaluation Rationale |
|---|---|---|
| Repo / coding agents | OpenAI o1-mini | Higher SWE-bench (56.4%). |
| High-volume chat | Gemini 2.5 Flash | Lower output list price ($2.5/1M). |
| Voice / low-latency UI | Gemini 2.5 Flash | Lower TTFT (110 ms). |
| Long-document RAG | Gemini 2.5 Flash | Larger window (1M). |
| Screenshots / vision | Gemini 2.5 Flash | Gemini 2.5 Flash is the side marked multimodal in the catalog. |
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Verified Head-to-Head Telemetry
