Gemini 2.5 Flash vs Gemini 2.5 Pro
A complete head-to-head: pricing, context window, benchmarks, modality coverage, and openness, with a programmatic verdict synthesized from the underlying data.
- PriceGemini 2.5 Flash
Gemini 2.5 Flash is roughly 33.3× cheaper on output tokens ($0.30 vs $10.00 per 1M).
- Context windowGemini 2.5 Pro
Gemini 2.5 Pro accepts 2.1M tokens vs 1.0M, 2.0× the room for long documents and codebases.
- BenchmarksTie
No directly comparable public benchmarks are available for both models, check the spec sheets for individual scores.
- ModalitiesGemini 2.5 Pro
Gemini 2.5 Pro supports 4 modalities (text, vision, audio, video) vs 3 for Gemini 2.5 Flash.
- OpennessTie
Both are closed-weight, API-only.
On balance Gemini 2.5 Pro edges ahead, winning 2 of 5 categories against Gemini 2.5 Flash's 1. Gemini 2.5 Flash is roughly 33.3× cheaper on output tokens ($0.30 vs $10.00 per 1M). Gemini 2.5 Pro accepts 2.1M tokens vs 1.0M, 2.0× the room for long documents and codebases.
No directly comparable public benchmarks are available for both models, check the spec sheets for individual scores. They differ in modality coverage, Gemini 2.5 Flash handles text, vision, audio while Gemini 2.5 Pro handles text, vision, audio, video, which can be the deciding factor before you even look at benchmarks. Both are closed-weight, API-only.
Both shipped within roughly a month of each other in 2025, so they share the same generation of training data and tooling. Gemini 2.5 Flash is usually picked for rag and long context workloads, while Gemini 2.5 Pro sees more deployments in long context and rag. If pricing matters more than every last benchmark point, run the numbers in the calculator below before committing.
Side-by-side specs
| Spec | Gemini 2.5 Flash | Gemini 2.5 Pro |
|---|---|---|
| Provider | ||
| Released | Apr 2025 | Mar 2025 |
| Modalities | text, vision, audio | text, vision, audio, video |
| Context window | 1.0M tokens | 2.1M tokens |
| Max output | , | , |
| Input · 1M | $0.075 / 1M tokens | $1.25 / 1M tokens |
| Output · 1M | $0.30 / 1M tokens | $10.00 / 1M tokens |
| Knowledge cutoff | 2025-01 | 2025-01 |
| Open weights | No | No |
| API available | Yes | Yes |
Pricing at scale
What you'd actually pay at typical workloads. Numbers come from each model's published per-million-token rates.
- Light usage, 100k in / 50k out per day$0.675 vs $18.75
- Heavy usage, 1M in / 500k out per day$6.75 vs $188
- RAG workload, 5M in / 200k out per day$13.05 vs $248
Light usage, 100k in / 50k out per day: $0.675 vs $18.75 per month, model A comes out ahead. Heavy usage, 1M in / 500k out per day: $6.75 vs $188 per month, model A comes out ahead. RAG workload, 5M in / 200k out per day: $13.05 vs $248 per month, model A comes out ahead.
Estimated spend for the listed models at your usage. Numbers are derived from each model's published per-million-token rates.
- Gemini 2.5 Flash$0.022
- Gemini 2.5 Pro$0.625
Benchmarks compared
Only sourced numbers. Where a benchmark is missing for one model we show the available value rather than fabricating the other.
- MMLU,86.0
- GPQA,84.0
Gemini 2.5 Flash fits when…
- Cheap and fast
- Long context
- Solid vision
- Cost-sensitive workloads, 33.3× cheaper than Gemini 2.5 Pro on output tokens.
Gemini 2.5 Pro fits when…
- 2M-token context window
- Strong on long-document tasks
- Native multimodal handling
- Long-context tasks, handles 2.1M tokens vs 1.0M for Gemini 2.5 Flash.
- Multimodal needs covering video.
Consider Gemini 3 Pro
Google's late-2025 flagship, set new benchmarks on long-context, vision, and reasoning at competitive pricing.
Frequently asked
Is Gemini 2.5 Flash or Gemini 2.5 Pro cheaper?
Gemini 2.5 Flash is cheaper at $0.30 / 1M tokens per million output tokens, vs $10.00 / 1M tokens for Gemini 2.5 Pro.Which has the larger context window?
Gemini 2.5 Pro accepts 2.1M tokens vs 1.0M for Gemini 2.5 Flash.Is Gemini 2.5 Flash or Gemini 2.5 Pro better for coding?
Both Gemini 2.5 Flash and Gemini 2.5 Pro are competitive on coding benchmarks. See each model's individual spec page for HumanEval and SWE-bench scores where published. For an opinionated pick, consult our Best LLM for Coding ranking.Are either of these models open source?
Neither model ships open weights, both are accessible only via their respective providers' APIs.When were Gemini 2.5 Flash and Gemini 2.5 Pro released?
Gemini 2.5 Flash was released by Google on 2025-04-09. Gemini 2.5 Pro was released by Google on 2025-03-25.
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