GPT-5 vs Gemini 2.5 Pro
OpenAI vs Google · Prices checked 12 August 2026
GPT-5 and Gemini 2.5 Pro land at the same blended rate of $3.88 per million tokens, so cost alone will not separate them.
GPT-5 leads on 5 of the 6 benchmarks both models report. The widest gap is on SWE-bench Verified, where GPT-5 leads by 11 points. 1 suite tied. Gemini 2.5 Pro takes a 1,000,000-token context window against 400,000, giving 2.5× more room for long documents or whole-codebase work. GPT-5 was released 2025; Gemini 2.5 Pro 2025.
Pricing and capacity
| Metric | GPT-5 | Gemini 2.5 Pro | Difference |
|---|---|---|---|
| Input / 1M tokens | $1.25 | $1.25 | level |
| Output / 1M tokens | $10.00 | $10.00 | level |
| Blended · 70/30calculated | $3.88 | $3.88 | level |
| Blended · 50/50calculated | $5.63 | $5.63 | level |
| Blended · 80/20calculated | $3.00 | $3.00 | level |
| Blended · 20/80calculated | $8.25 | $8.25 | level |
| Job cost · 100K + 10Kcalculated | $0.225 | $0.225 | level |
| Job cost · 1M + 100Kcalculated | $2.25 | $2.25 | level |
| Context window | 400,000 | 1,000,000 | 2.5× |
Input and output rates are as published by each provider. Blended and job-cost rows are calculated comparison metrics, not published prices — how they are derived.
Benchmarks
| Benchmark | GPT-5 | Gemini 2.5 Pro | Leader |
|---|---|---|---|
| MMLU | 91% | 89% | GPT-5 |
| GPQA Diamond | 84% | 84% | Level |
| MATH | 95% | 93% | GPT-5 |
| HumanEval | 96% | 92% | GPT-5 |
| SWE-bench Verified | 75% | 64% | GPT-5 |
| LMArena Elo | 1399 Elo | 1389 Elo | GPT-5 |
Only suites both models report are listed, so a missing score is never shown as a loss. Figures are provider-published or from public leaderboards and are not independently re-run.
What each model is for
GPT-5
OpenAI · Frontier
OpenAI's 2025 flagship, unified reasoning + multimodal model with a 400K context. Replaces the GPT-4 line as the default ChatGPT and API model.
- Unified reasoning + chat
- 400K context
- Native vision
- Strong tool use
Gemini 2.5 Pro
Google · Frontier
Google's flagship Gemini. 1M-token context, native multimodal across text, image, audio and video, with thinking enabled.
- 1M context (2M in private beta)
- Native video + audio understanding
- Strong reasoning with thinking
- Tight Google ecosystem
Frequently asked questions
Which is cheaper, GPT-5 or Gemini 2.5 Pro?
GPT-5 and Gemini 2.5 Pro land at the same blended rate of $3.88 per million tokens, so cost alone will not separate them. Blended cost weights input at 70% and output at 30%; price your own token split for an exact answer, since the cheaper model on a blended basis is not always cheaper for your workload.
Which performs better, GPT-5 or Gemini 2.5 Pro?
GPT-5 leads on 5 of the 6 benchmarks both models report. The widest gap is on SWE-bench Verified, where GPT-5 leads by 11 points. 1 suite tied. These are the figures each provider or public leaderboard publishes, not results we re-run, and a benchmark average can hide the specific behaviour your workload depends on.
Which has the larger context window, GPT-5 or Gemini 2.5 Pro?
Gemini 2.5 Pro takes a 1,000,000-token context window against 400,000, giving 2.5× more room for long documents or whole-codebase work. The context window caps everything in a single request: prompt, retrieved documents, conversation history and the model’s own output all share it.
Can I compare GPT-5 and Gemini 2.5 Pro on my own numbers?
Yes. Open both in the side-by-side comparison tool to see every field at once, or use the token calculator to price your actual prompt and monthly request volume against each model. Both are free and need no sign-up.
Price it for your own workload
Related matchups
Terms used on this page
Prices and scores are recomputed on every deploy from the catalogue. Prices checked 12 August 2026.