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OpenAI: GPT-5 Nano

openai/gpt-5-nano

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GPT-5-Nano is the smallest and fastest variant in the GPT-5 system, optimized for developer tools, rapid interactions, and ultra-low latency environments. While limited in reasoning depth compared to its larger counterparts, it retains key instruction-following and safety features. It is the successor to GPT-4.1-nano and offers a lightweight option for cost-sensitive or real-time applications.

Modalities
In / Out Price
$0.05 / $0.40per 1M
Context
400K
Released
Aug 7, 2025
Knowledge Cutoff
May 2024
Compare
ProvidersPricingPerformanceUptimeBenchmarksAppsActivityFAQExplore

Providers

Different companies host the same model. OpenRouter routes your request to one of them based on the routing mode you pick — Balanced (price + speed), Nitro (fastest), Floor (cheapest), or Exacto (highest tool-calling accuracy).

Pricing

The average price customers actually pay for this model, next to the prices providers post. Caching and discounts mean the price actually paid is often well below the listed one.

Performance

Throughput is how fast the model writes (tokens per second — higher is better). Latency is total round-trip time (lower is better). TTFT is time-to-first-token — how long before you see anything appear (lower is better).

Uptime

Uptime is the percentage of the past 3 days that at least one provider was responding to requests. Availability is the percentage of time that inference was successfully served. OpenRouter continuously monitors and uses the next-best provider when one returns an error.

Benchmarks

Scores on standardized evaluations and this model’s own outputs on shared benchmark prompts. Higher percentages are better — and each rank shows where this model lands among the models evaluated on that source.

Benchmark score summary for OpenAI: GPT-5 Nano (Artificial Analysis, Design Arena and Vals AI)
SourceBenchmarkScore
Artificial AnalysisGPT-5 nano (Minimal) Intelligence Index7.1
Artificial AnalysisGPT-5 nano (Minimal) Math Index27.3
Artificial AnalysisGPT-5 nano (Minimal) GPQA Diamond42.8%
Artificial AnalysisGPT-5 nano (Minimal) HLE4.0%
Artificial AnalysisGPT-5 nano (Minimal) IFBench32.5%
Artificial AnalysisGPT-5 nano (Minimal) τ²-Bench Telecom25.7%
Artificial AnalysisGPT-5 nano (Minimal) AA-LCR20.0%
Artificial AnalysisGPT-5 nano (Minimal) CritPt0.0%
Artificial AnalysisGPT-5 nano (Minimal) LiveCodeBench47.0%
Artificial AnalysisGPT-5 nano (Minimal) Terminal-Bench Hard6.8%
Artificial AnalysisGPT-5 nano (Minimal) MMLU-Pro55.6%
Artificial AnalysisGPT-5 nano (Minimal) AA-Omniscience Accuracy13.1%
Artificial AnalysisGPT-5 nano (Minimal) AA-Omniscience Non-Hallucination Rate11.2%
Artificial AnalysisGPT-5 nano (Minimal) AIME 202527.3%
Artificial AnalysisGPT-5 nano (High) Intelligence Index13.0
Artificial AnalysisGPT-5 nano (High) Math Index83.7
Artificial AnalysisGPT-5 nano (High) GPQA Diamond67.6%
Artificial AnalysisGPT-5 nano (High) HLE9.5%
Artificial AnalysisGPT-5 nano (High) IFBench67.6%
Artificial AnalysisGPT-5 nano (High) τ²-Bench Telecom36.5%
Artificial AnalysisGPT-5 nano (High) AA-LCR45.0%
Artificial AnalysisGPT-5 nano (High) CritPt0.0%
Artificial AnalysisGPT-5 nano (High) LiveCodeBench78.9%
Artificial AnalysisGPT-5 nano (High) Terminal-Bench Hard12.1%
Artificial AnalysisGPT-5 nano (High) MMLU-Pro78.0%
Artificial AnalysisGPT-5 nano (High) AA-Omniscience Accuracy19.1%
Artificial AnalysisGPT-5 nano (High) AA-Omniscience Non-Hallucination Rate41.0%
Artificial AnalysisGPT-5 nano (High) AIME 202583.7%
Artificial AnalysisGPT-5 nano (Medium) Intelligence Index12.5
Artificial AnalysisGPT-5 nano (Medium) Math Index78.3
Artificial AnalysisGPT-5 nano (Medium) GPQA Diamond67.0%
Artificial AnalysisGPT-5 nano (Medium) HLE8.7%
Artificial AnalysisGPT-5 nano (Medium) IFBench65.9%
Artificial AnalysisGPT-5 nano (Medium) τ²-Bench Telecom30.4%
Artificial AnalysisGPT-5 nano (Medium) AA-LCR43.7%
Artificial AnalysisGPT-5 nano (Medium) CritPt0.0%
Artificial AnalysisGPT-5 nano (Medium) LiveCodeBench76.3%
Artificial AnalysisGPT-5 nano (Medium) Terminal-Bench Hard17.4%
Artificial AnalysisGPT-5 nano (Medium) MMLU-Pro77.2%
Artificial AnalysisGPT-5 nano (Medium) AA-Omniscience Accuracy17.6%
Artificial AnalysisGPT-5 nano (Medium) AA-Omniscience Non-Hallucination Rate47.4%
Artificial AnalysisGPT-5 nano (Medium) AIME 202578.3%
Design ArenaGPT-5 nano (Default) Models Arena 3D Elo981
Design ArenaGPT-5 nano (Default) Models Arena Code Categories Elo1090
Design ArenaGPT-5 nano (Default) Models Arena Data Visualization Elo1064
Design ArenaGPT-5 nano (Default) Models Arena Game Development Elo1057
Design ArenaGPT-5 nano (Default) Models Arena UI Component Elo1073
Design ArenaGPT-5 nano (Default) Models Arena Website Elo1108
Vals AIGPT 5 Nano AIME81.2%
Vals AIGPT 5 Nano CaseLaw v252.6%
Vals AIGPT 5 Nano GPQA Diamond63.4%
Vals AIGPT 5 Nano LiveCodeBench70.2%
Vals AIGPT 5 Nano LegalBench50.1%
Vals AIGPT 5 Nano MATH 50093.8%
Vals AIGPT 5 Nano MedCode30.4%
Vals AIGPT 5 Nano MedQA93.3%
Vals AIGPT 5 Nano MedScribe72.9%
Vals AIGPT 5 Nano MGSM89.3%
Vals AIGPT 5 Nano MMLU Pro76.1%
Vals AIGPT 5 Nano MMMU Pro70.9%
Vals AIGPT 5 Nano MortgageTax53.6%
Vals AIGPT 5 Nano ProofBench v112.0%
Vals AIGPT 5 Nano SAGE30.4%
Vals AIGPT 5 Nano TaxEval v267.4%

Apps

Public apps that send the most traffic to this model. Good signal for what real production workloads look like — and a hint at which use cases this model is best suited for.

Activity

Token volume and request traffic to this model over time.

API

Drop-in code to call this model. OpenRouter's API is OpenAI-compatible — most SDKs work by just swapping the base URL. The only thing that changes between models is the model slug below.

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Throughput
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P50, best across providers

Latency
1.46s

P50, best provider

AutoExacto benchmarks
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Uptime (3d)The model was reachable. Request routed to a provider.
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Availability (3d)The model returned inference from any provider. Errors and empty responses count against it.
99.99%

Availability over the last 3 days

Last 72 hours
Availability 99.99%
3 Days Ago2 Days AgoYesterdayNow

Availability over the last 24 hours

OpenRouter Availability
99.98%
Without Routing
99.78%

When an error occurs in an upstream provider, we can recover by routing to another healthy provider, if your request filters allow it. You can access per-provider uptime data programmatically through the Endpoints API. Learn more about our load balancing and customization options.

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Frequently asked questions

GPT-5-Nano is the smallest and fastest variant in the GPT-5 system, optimized for developer tools, rapid interactions, and ultra-low latency environments. While limited in reasoning depth compared to its larger counterparts, it retains key instruction-following and safety features. It is the successor to GPT-4.1-nano and offers a lightweight option for cost-sensitive or real-time applications.

GPT-5 Nano costs $0.05/M input tokens and $0.40/M output tokens, with separate rates for Cache Read at $0.01/M tokens.

GPT-5 Nano has a 400,000 token context window.

Yes. GPT-5 Nano accepts tools and tool_choice for function calling. It also supports structured outputs via a JSON schema in response_format.

GPT-5 Nano accepts text, images, and files such as PDFs as input and returns text.

GPT-5 Nano is served by 2 providers on OpenRouter: OpenAI and Azure. Requests are routed to the best available provider, with automatic failover to the others, and you can pin or exclude providers with provider routing.

GPT-5 Nano was released on August 7, 2025. Its knowledge cutoff is May 31, 2024.

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