This model is deprecated. We only continue performance benchmarking for the default 10k input token workload. Results for other workloads are historical and no longer updated.
Google has launched a newer release, Gemini 2.5 Flash Preview (Sep '25). We suggest considering it instead.
Gemini 2.5 Flash (Reasoning) API Provider Benchmarking & Analysis
This analysis is intended to support you in choosing the best API provider of Gemini 2.5 Flash (Reasoning) for your use-case.
Fastest
Google (AI Studio)Google (Vertex)Output speed
Total 2 providers
Lowest Latency
Google (AI Studio)Google (Vertex)Time to first answer token
Total 2 providers
Lowest Price
Google (AI Studio)Google (Vertex)Blended price (per 1M tokens)
Total 2 providers
Gemini 2.5 Flash is available through 2 API providers, each offering different performance characteristics and pricing. Below is a comparison of the key metrics across providers.
- For output speed, the top providers are Google (AI Studio) (211.0 t/s) and Google (Vertex) (189.7 t/s).
- For latency, Google (AI Studio) (19.90s) and Google (Vertex) (20.40s) offer the lowest time to first answer token.
- For pricing, Google (AI Studio) (0.33) and Google (Vertex) (0.33) offer the lowest blended prices per 1M tokens.
- Google (AI Studio) stands out as the overall leader, ranking first across all three categories: speed, latency, and pricing.
Pricing
Pricing: Cache Hit, Input, and Output
Pricing: Blended Price
Pricing: Cache Discount
Output Speed vs. Price
Speed
Measured by Output Speed (tokens per second)
Output Speed: Gemini 2.5 Flash (Reasoning)
Latency vs. Output Speed
Latency
Measured by Time (seconds) to First Token
Time to First Answer Token
End-to-End Response Time
Seconds to output 500 tokens, calculated based on time to first token, 'thinking' time for reasoning models, and output speed
End-to-End Response Time
Key Comparison Metrics & API Features
Frequently Asked Questions
Common questions about Gemini 2.5 Flash (Reasoning) providers
Gemini 2.5 Flash (Reasoning) is available through 2 API providers: Google (AI Studio) and Google (Vertex). Each provider offers different performance characteristics and pricing.
Gemini 2.5 Flash (Reasoning) is currently available through 2 API providers that we benchmark and track.
The fastest providers for Gemini 2.5 Flash (Reasoning) by output speed are Google (AI Studio) (211.0 t/s) and Google (Vertex) (189.7 t/s). Output speed measures how quickly tokens are generated after the model starts responding.
The providers with the lowest time to first answer token for Gemini 2.5 Flash (Reasoning) are Google (AI Studio) (19.90s) and Google (Vertex) (20.40s). Lower latency means faster initial response time.
The most affordable providers for Gemini 2.5 Flash (Reasoning) by blended price are Google (AI Studio) ($0.33 per 1M tokens) and Google (Vertex) ($0.33 per 1M tokens). Blended price uses a 7:2:1 cache hit/input/output token ratio.
The providers with the lowest input token pricing for Gemini 2.5 Flash (Reasoning) are Google (AI Studio) ($0.30 per 1M input tokens) and Google (Vertex) ($0.30 per 1M input tokens).
The providers with the lowest output token pricing for Gemini 2.5 Flash (Reasoning) are Google (AI Studio) ($2.50 per 1M output tokens) and Google (Vertex) ($2.50 per 1M output tokens).
All 2 providers of Gemini 2.5 Flash (Reasoning) support JSON mode for structured output.
All 2 providers of Gemini 2.5 Flash (Reasoning) support function calling (tool use).
Google (AI Studio) leads across all key metrics for Gemini 2.5 Flash (Reasoning), offering the fastest speed, lowest latency, and most competitive pricing.
When choosing a provider for Gemini 2.5 Flash (Reasoning), consider: output speed (for throughput-intensive tasks), latency (for interactive applications requiring quick first responses), pricing (for cost-sensitive workloads), and API features like JSON mode or function calling.
Yes, provider performance can vary over time due to infrastructure changes, load balancing, and updates. We continuously benchmark all providers and display historical performance trends in the "Over Time" charts.
For information about Gemini 2.5 Flash (Reasoning)'s intelligence, capabilities, modalities, and how it compares to other models, see the model overview page. View model overview