Google has launched a newer model, Gemini 3 Flash, we suggest considering this model instead.
For more information, see Comparison of Gemini 3 Flash to other models and API provider benchmarks for Gemini 3 Flash.
Gemini 2.5 Flash Preview (Sep '25) (Non-reasoning) Intelligence, Performance & Price Analysis
Model summary
Intelligence
Artificial Analysis Intelligence Index
Speed
Output tokens per second
Input Price
USD per 1M tokens
Output Price
USD per 1M tokens
Verbosity
Output tokens from Intelligence Index
Metrics are compared against models of the same class:
- Non-reasoning models → compared only with other non-reasoning models
- Reasoning models → compared across both reasoning and non-reasoning
- Open weights models → compared only with other open weights models of the same size class:
- Tiny: ≤4B parameters
- Small: 4B–40B parameters
- Medium: 40B–150B parameters
- Large: >150B parameters
- Proprietary models → compared across proprietary and open weights models of the same price range, using a blended 3:1 input/output price ratio:
- <$0.15 per 1M tokens
- $0.15–$1 per 1M tokens
- >$1 per 1M tokens
| Reasoning | No This page shows the non-reasoning version of this model. A reasoning variant may also exist. |
|---|---|
| Input modality | Supports: text, image, speech, video |
| Output modality | Supports: text |
| Context window | 1m ~1500 A4 pages of size 12 Arial font |
Gemini 2.5 Flash Preview (Sep '25) (Non-reasoning) is amongst the leading models in intelligence, but particularly expensive when comparing to other non-reasoning models of similar price. It's also notably fast, however very verbose. The model supports text, image, speech, and video input, outputs text, and has a 1m tokens context window.
Gemini 2.5 Flash Preview (Sep '25) (Non-reasoning) scores 26 on the Artificial Analysis Intelligence Index, placing it well above average among comparable models (averaging 15). When evaluating the Intelligence Index, it generated 23M tokens, which is very verbose in comparison to the average of 4.9M.
Pricing for Gemini 2.5 Flash Preview (Sep '25) (Non-reasoning) is $0.30 per 1M input tokens (somewhat expensive, average: $0.20) and $2.50 per 1M output tokens (expensive, average: $0.66). In total, it cost $105.60 to evaluate Gemini 2.5 Flash Preview (Sep '25) (Non-reasoning) on the Intelligence Index.
At 271 tokens per second, Gemini 2.5 Flash Preview (Sep '25) (Non-reasoning) is notably fast (102).
Intelligence
Artificial Analysis Intelligence Index
Artificial Analysis Intelligence Index v4.0 includes: GDPval-AA, 𝜏²-Bench Telecom, Terminal-Bench Hard, SciCode, AA-LCR, AA-Omniscience, IFBench, Humanity's Last Exam, GPQA Diamond, CritPt. See Intelligence Index methodology for further details, including a breakdown of each evaluation and how we run them.
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Artificial Analysis Intelligence Index by Open Weights / Proprietary
Artificial Analysis Intelligence Index v4.0 includes: GDPval-AA, 𝜏²-Bench Telecom, Terminal-Bench Hard, SciCode, AA-LCR, AA-Omniscience, IFBench, Humanity's Last Exam, GPQA Diamond, CritPt. See Intelligence Index methodology for further details, including a breakdown of each evaluation and how we run them.
Indicates whether the model weights are available. Models are labelled as 'Commercial Use Restricted' if the weights are available but commercial use is limited (typically requires obtaining a paid license).
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Intelligence Evaluations
While model intelligence generally translates across use cases, specific evaluations may be more relevant for certain use cases.
Artificial Analysis Intelligence Index v4.0 includes: GDPval-AA, 𝜏²-Bench Telecom, Terminal-Bench Hard, SciCode, AA-LCR, AA-Omniscience, IFBench, Humanity's Last Exam, GPQA Diamond, CritPt. See Intelligence Index methodology for further details, including a breakdown of each evaluation and how we run them.
Openness
Artificial Analysis Openness Index: Results
Intelligence Index Comparisons
Intelligence vs. Price
While higher intelligence models are typically more expensive, they do not all follow the same price-quality curve.
Artificial Analysis Intelligence Index v4.0 includes: GDPval-AA, 𝜏²-Bench Telecom, Terminal-Bench Hard, SciCode, AA-LCR, AA-Omniscience, IFBench, Humanity's Last Exam, GPQA Diamond, CritPt. See Intelligence Index methodology for further details, including a breakdown of each evaluation and how we run them.
Price per token, represented as USD per million Tokens. Price is a blend of Input & Output token prices (3:1 ratio).
Figures represent performance of the model's first-party API (e.g. OpenAI for o1) or the median across providers where a first-party API is not available (e.g. Meta's Llama models).
Intelligence Index Token Use & Cost
Output Tokens Used to Run Artificial Analysis Intelligence Index
The number of tokens required to run all evaluations in the Artificial Analysis Intelligence Index (excluding repeats).
Cost to Run Artificial Analysis Intelligence Index
The cost to run the evaluations in the Artificial Analysis Intelligence Index, calculated using the model's input and output token pricing and the number of tokens used across evaluations (excluding repeats).
Context Window
Context Window
Larger context windows are relevant to RAG (Retrieval Augmented Generation) LLM workflows which typically involve reasoning and information retrieval of large amounts of data.
Maximum number of combined input & output tokens. Output tokens commonly have a significantly lower limit (varied by model).
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Pricing
Pricing: Input and Output Prices
Price per token included in the request/message sent to the API, represented as USD per million Tokens.
Figures represent performance of the model's first-party API (e.g. OpenAI for o1) or the median across providers where a first-party API is not available (e.g. Meta's Llama models).
Intelligence vs. Price (Log Scale)
While higher intelligence models are typically more expensive, they do not all follow the same price-quality curve.
Artificial Analysis Intelligence Index v4.0 includes: GDPval-AA, 𝜏²-Bench Telecom, Terminal-Bench Hard, SciCode, AA-LCR, AA-Omniscience, IFBench, Humanity's Last Exam, GPQA Diamond, CritPt. See Intelligence Index methodology for further details, including a breakdown of each evaluation and how we run them.
Price per token, represented as USD per million Tokens. Price is a blend of Input & Output token prices (3:1 ratio).
Figures represent performance of the model's first-party API (e.g. OpenAI for o1) or the median across providers where a first-party API is not available (e.g. Meta's Llama models).
Pricing Comparison of Gemini 2.5 Flash Preview (Sep '25) (Non-reasoning) API Providers
Speed
Measured by Output Speed (tokens per second)
Output Speed
Tokens per second received while the model is generating tokens (ie. after first chunk has been received from the API for models which support streaming).
Figures represent performance of the model's first-party API (e.g. OpenAI for o1) or the median across providers where a first-party API is not available (e.g. Meta's Llama models).
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Output Speed vs. Price
Tokens per second received while the model is generating tokens (ie. after first chunk has been received from the API for models which support streaming).
Price per token, represented as USD per million Tokens. Price is a blend of Input & Output token prices (3:1 ratio).
Latency
Measured by Time (seconds) to First Token
Latency: Time To First Answer Token
Time to first answer token received, in seconds, after API request sent. For reasoning models, this includes the 'thinking' time of the model before providing an answer. For models which do not support streaming, this represents time to receive the completion.
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
Seconds to receive a 500 token response. Key components:
- Input time: Time to receive the first response token
- Thinking time (only for reasoning models): Time reasoning models spend outputting tokens to reason prior to providing an answer. Amount of tokens based on the average reasoning tokens across a diverse set of 60 prompts (methodology details).
- Answer time: Time to generate 500 output tokens, based on output speed
Figures represent performance of the model's first-party API (e.g. OpenAI for o1) or the median across providers where a first-party API is not available (e.g. Meta's Llama models).
Model Size (Open Weights Models Only)
Model Size: Total and Active Parameters
The total number of trainable weights and biases in the model, expressed in billions. These parameters are learned during training and determine the model's ability to process and generate responses.
The number of parameters actually executed during each inference forward pass, expressed in billions. For Mixture of Experts (MoE) models, a routing mechanism selects a subset of experts per token, resulting in fewer active than total parameters. Dense models use all parameters, so active equals total.
Comparisons to Gemini 2.5 Flash (Sep)
- Gemini 2.5 Flash (Sep)
gpt-oss-120B (high)- gpt-oss-20B (high)
- GPT-5.2 (xhigh)
- GPT-5.2 Codex (xhigh)
Llama 4 Maverick- Gemini 3 Pro Preview (high)
- Gemini 3 Flash
Claude Opus 4.5- Claude 4.5 Haiku
- Claude 4.5 Sonnet
- Claude Opus 4.6 (Adaptive)
- Claude Opus 4.6
Mistral Large 3
DeepSeek V3.2
Grok 4.1 Fast- Grok 4
Nova 2.0 Pro Preview (medium)
MiniMax-M2.1- MiniMax-M2.5
NVIDIA Nemotron 3 Nano
Kimi K2.5
K-EXAONE
MiMo-V2-Flash (Feb 2026)
KAT-Coder-Pro V1
K2 Think V2
GLM-4.7- GLM-5
Qwen3 235B A22B 2507
FAQ
Common questions about Gemini 2.5 Flash Preview (Sep '25) (Non-reasoning)
Gemini 2.5 Flash Preview (Sep '25) (Non-reasoning) was released on September 25, 2025.
Gemini 2.5 Flash Preview (Sep '25) (Non-reasoning) was created by Google.
Gemini 2.5 Flash Preview (Sep '25) (Non-reasoning) scores 26 on the Artificial Analysis Intelligence Index, placing it well above average among other non-reasoning models in a similar price tier (median: 15).
Gemini 2.5 Flash Preview (Sep '25) (Non-reasoning) generates output at 270.8 tokens per second (based on Google's API), which is well above average compared to other non-reasoning models in a similar price tier (median: 102.2 t/s).
Gemini 2.5 Flash Preview (Sep '25) (Non-reasoning) has a time to first token (TTFT) of 0.28s (based on Google's API), which is very competitive compared to other non-reasoning models in a similar price tier (median: 0.56s).
Gemini 2.5 Flash Preview (Sep '25) (Non-reasoning) costs $0.30 per 1M input tokens (somewhat higher than average, median: $0.20) and $2.50 per 1M output tokens (at the higher end, median: $0.66), based on Google's API.
Gemini 2.5 Flash Preview (Sep '25) (Non-reasoning) costs $0.30 per 1M input tokens and $2.50 per 1M output tokens (based on Google's API). For a blended rate (3:1 input to output ratio), this is $0.85 per 1M tokens. Pricing may vary by provider. Compare provider pricing →
When evaluated on the Intelligence Index, Gemini 2.5 Flash Preview (Sep '25) (Non-reasoning) generated 23M output tokens, which is at the higher end compared to other non-reasoning models in a similar price tier (median: 4.9M).
No, Gemini 2.5 Flash Preview (Sep '25) (Non-reasoning) is not a reasoning model. It provides direct responses without extended chain-of-thought reasoning.
Gemini 2.5 Flash Preview (Sep '25) (Non-reasoning) supports text, image, speech, and video input.
Gemini 2.5 Flash Preview (Sep '25) (Non-reasoning) supports text output.
Yes, Gemini 2.5 Flash Preview (Sep '25) (Non-reasoning) supports image input and can analyze, describe, and answer questions about images.
Yes, Gemini 2.5 Flash Preview (Sep '25) (Non-reasoning) is multimodal. It can process text, image, speech, and video input and generate text output.
Gemini 2.5 Flash Preview (Sep '25) (Non-reasoning) has a context window of 1.0M tokens. This determines how much text and conversation history the model can process in a single request.
No, Gemini 2.5 Flash Preview (Sep '25) (Non-reasoning) is proprietary. The model weights are not publicly available.
Gemini 2.5 Flash Preview (Sep '25) (Non-reasoning) is a proprietary model and Google has not disclosed the model size or parameter count.
Gemini 2.5 Flash Preview (Sep '25) (Non-reasoning) achieves a score of 26 on the Artificial Analysis Intelligence Index. This composite benchmark evaluates models across reasoning, knowledge, mathematics, and coding.
Yes, Gemini 2.5 Flash Preview (Sep '25) (Non-reasoning) is available via API through 1 provider. Compare API providers →
Gemini 2.5 Flash Preview (Sep '25) (Non-reasoning) is available through 1 API provider. Compare providers →