Kimi K2 Instruct vs GPT-5 Nano
At a Glance
| Compare |  Kimi K2 InstructMoonshot AI |  GPT-5 NanoOpenAI |
|---|---|---|
| Intelligence, Cost, and Efficiency | ||
| IntelligenceHigher is better · MM Intelligence v2.5 | UnrankedNot in the 46-model eligible cohort | #46 of 460.0 score · 2/3 sources · provisional · missing LiveBench · full-core range 0.0–33.3 |
| Pricing and Limits | ||
| Input priceFrom · USD / 1M tokens | $0.57Openrouter ↗ · Aug 29, 2026 | $0.025Openrouter ↗ · Sep 3, 2026 |
| Output priceFrom · USD / 1M tokens | $2.30Openrouter ↗ · Aug 29, 2026 | $0.20Openrouter ↗ · Sep 3, 2026 |
| Context windowMaximum documented tokens | 131K | 400K |
| Model facts checked | Aug 28, 2026View model evidence → | Sep 3, 2026View model evidence → |
Token prices are the lowest available sourced USD rates; input and output may use different providers. Cost ranking estimates output spend on LiveBench, not a full request bill. Ranking methodology →
Available Benchmarks
| Benchmark | Kimi-K2-Instruct | GPT-5 Nano |
|---|---|---|
| Berkeley Function Calling Leaderboardv4-ede5081a24bc · overall_accuracy · leader | 59.06100% of row best · percent · Moonshotai-Kimi-K2-Instruct (FC) | 27.5547% of row best · percent · GPT-5-nano-2025-08-07 (Prompt) |
| Overall ResultCounted from the protocol-matched rows above | 1 benchmark winNo overall winner | 0 benchmark winsNo overall winner |
Third-party benchmark Only like-for-like primary-publisher results are shown; raw scores, relative scores, configuration, and token spend remain visible.
Side-by-Side Facts
| Field | Kimi-K2-Instruct | GPT-5 Nano |
|---|---|---|
| Developer | Moonshot AI | OpenAI |
| Family | Kimi K2 Instruct | Gpt 5 |
| Model | Kimi-K2-Instruct | GPT-5 Nano |
| Version | Kimi-K2-Instruct | GPT-5 Nano |
| Lifecycle | active | active |
| Released | 2025-07-11 | 2025-08-07 |
| Knowledge cutoff | Unknown | 2024-05-31 |
| Input modalities | Text | Text, Image |
| Output modalities | Text | Text |
| Context window | 131K | 400K |
| Total parameters | 1T | Unknown |
| Active parameters | 32B | Unknown |
| License | other | Unknown |
| Open weights | Yes | No |
| API available | Yes | Yes |
| Self-hostable | Yes | No |
| Provider access | Hugging Face (Standard), Openrouter (Standard) | Openai (Standard), Openrouter (Standard) |
| Capabilities | chat, generation, tools | chat, generation, reasoning, structured_outputs, tools |
Kimi K2 Instruct Capabilities
GPT-5 Nano Capabilities
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Kimi-K2-InstructMoonshot AI | vs |  GLM-5.3Z.ai | cross-developer peerstext |
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Primary Evidence
Sources and Freshness
Questions
Kimi K2 Instruct vs GPT-5 Nano FAQs
Is Kimi K2 Instruct or GPT-5 Nano better for coding?+
This comparison does not currently contain a protocol-matched coding benchmark for both Kimi K2 Instruct and GPT-5 Nano, so Model Markets cannot name a coding leader from pricing, context size, or capability labels alone.
Which is cheaper, Kimi K2 Instruct or GPT-5 Nano?+
Kimi K2 Instruct is $0.57 and GPT-5 Nano is $0.025 per million tokens, so GPT-5 Nano is cheaper on this metric. Kimi K2 Instruct is $2.30 and GPT-5 Nano is $0.20 per million tokens, so GPT-5 Nano is cheaper on this metric.
Which has a larger context window, Kimi K2 Instruct or GPT-5 Nano?+
GPT-5 Nano has the larger sourced context window. Kimi K2 Instruct supports 131K and GPT-5 Nano supports 400K.
Which performs better in benchmarks, Kimi K2 Instruct or GPT-5 Nano?+
There is no overall benchmark winner: At least two independently verified, protocol-matched benchmarks are required for an overall winner.
Can Kimi K2 Instruct or GPT-5 Nano be self-hosted?+
Kimi K2 Instruct is the only model in this pair currently marked as self-hostable. Kimi K2 Instruct is open weight; GPT-5 Nano is not marked open weight.
Can Kimi K2 Instruct and GPT-5 Nano understand images?+
Kimi K2 Instruct is not documented with image input; GPT-5 Nano is documented with image input. This reflects supported input modalities, not vision quality.
Which can generate longer answers, Kimi K2 Instruct or GPT-5 Nano?+
Neither has a larger sourced maximum output. Kimi K2 Instruct is — and GPT-5 Nano is 128K.
Do Kimi K2 Instruct and GPT-5 Nano support reasoning and tool use?+
Kimi K2 Instruct: tool calling. GPT-5 Nano: reasoning, tool calling, and image input. Feature support does not establish relative quality.
Which is available from more inference providers, Kimi K2 Instruct or GPT-5 Nano?+
Kimi K2 Instruct has 2 sourced provider routes; GPT-5 Nano has 2, a tie.
Which offers better value, Kimi K2 Instruct or GPT-5 Nano?+
There is no universal value winner. Compare the input and output prices above with the matched benchmark result for your workload: cheaper tokens can be offset by different quality, token usage, latency, or provider availability.