Kimi K2 Instruct vs GPT-6 Astra
At a Glance
| Compare |  Kimi K2 InstructMoonshot AI |  GPT-6 AstraOpenAI |
|---|---|---|
| Intelligence, Cost, and Efficiency | ||
| IntelligenceHigher is better · MM Intelligence v2.5 | UnrankedNot in the 46-model eligible cohort | #6 of 4684.4 score · 3/3 sources · complete |
| CostLower is better · Published-token output estimate | UnrankedNot in the 44-model eligible cohort | #41 of 44$0.520 per LiveBench case |
| EfficiencyHigher is better · MM Efficiency v1.5 | UnrankedNot in the 38-model eligible cohort | #27 of 3849.2 score · 3/3 sources · complete |
| Pricing and Limits | ||
| Input priceFrom · USD / 1M tokens | $0.57Openrouter ↗ · Aug 29, 2026 | $10.00Openai ↗ · Sep 4, 2026 |
| Output priceFrom · USD / 1M tokens | $2.30Openrouter ↗ · Aug 29, 2026 | $50.00Openai ↗ · Sep 4, 2026 |
| Context windowMaximum documented tokens | 131K | 1,050K |
| Model facts checked | Aug 28, 2026View model evidence → | Sep 4, 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
Side-by-Side Facts
| Field | Kimi-K2-Instruct | GPT-6 Astra |
|---|---|---|
| Developer | Moonshot AI | OpenAI |
| Family | Kimi K2 Instruct | Gpt 6 |
| Model | Kimi-K2-Instruct | GPT-6 Astra |
| Version | Kimi-K2-Instruct | GPT-6 Astra |
| Lifecycle | active | active |
| Released | 2025-07-11 | 2026-09-03 |
| Knowledge cutoff | Unknown | 2026-04-30 |
| Input modalities | Text | Text, Image |
| Output modalities | Text | Text |
| Context window | 131K | 1,050K |
| 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, computer-use, generation, reasoning, research, tools |
Kimi K2 Instruct Capabilities
GPT-6 Astra Capabilities
Related Comparisons
All text comparisons →| A | Pair | B | Context |
|---|---|---|---|
Kimi-K2-InstructMoonshot AI | vs | GPT-5.6 SolOpenAI | cross-developer peerstext |
Claude Fable 5.1Anthropic | vs | Kimi-K2-InstructMoonshot AI | cross-developer peerstext |
 Gemini 3.1 ProGoogle DeepMind | vs | Kimi-K2-InstructMoonshot AI | cross-developer peerstext |
 DeepSeek-V4.1-FlashDeepSeek | vs | Kimi-K2-InstructMoonshot AI | cross-developer peerstext |
Kimi-K2-InstructMoonshot AI | vs | Grok 4.6xAI | cross-developer peerstext |
Kimi-K2-InstructMoonshot AI | vs |  Qwen3.8-MaxQwen | cross-developer peerstext |
Kimi-K2-InstructMoonshot AI | vs | Kimi-K3Moonshot AI | family variantstext |
 MiniMax-M3MiniMax | vs | Kimi-K2-InstructMoonshot AI | cross-developer peerstext |
Kimi-K2-InstructMoonshot AI | vs |  GLM-5.3Z.ai | cross-developer peerstext |
Kimi-K2-InstructMoonshot AI | vs |  Hy4 previewTencent | cross-developer peerstext |
Seed 2.1 ProByteDance Seed | vs | Kimi-K2-InstructMoonshot AI | cross-developer peerstext |
 Mistral Large 3Mistral AI | vs | Kimi-K2-InstructMoonshot AI | cross-developer peerstext |
Primary Evidence
Sources and Freshness
Questions
Kimi K2 Instruct vs GPT-6 Astra FAQs
Is Kimi K2 Instruct or GPT-6 Astra better for coding?+
This comparison does not currently contain a protocol-matched coding benchmark for both Kimi K2 Instruct and GPT-6 Astra, so Model Markets cannot name a coding leader from pricing, context size, or capability labels alone.
Which is cheaper, Kimi K2 Instruct or GPT-6 Astra?+
Kimi K2 Instruct is $0.57 and GPT-6 Astra is $10.00 per million tokens, so Kimi K2 Instruct is cheaper on this metric. Kimi K2 Instruct is $2.30 and GPT-6 Astra is $50.00 per million tokens, so Kimi K2 Instruct is cheaper on this metric.
Which has a larger context window, Kimi K2 Instruct or GPT-6 Astra?+
GPT-6 Astra has the larger sourced context window. Kimi K2 Instruct supports 131K and GPT-6 Astra supports 1,050K.
Which performs better in benchmarks, Kimi K2 Instruct or GPT-6 Astra?+
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-6 Astra 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-6 Astra is not marked open weight.
Can Kimi K2 Instruct and GPT-6 Astra understand images?+
Kimi K2 Instruct is not documented with image input; GPT-6 Astra is documented with image input. This reflects supported input modalities, not vision quality.
Which can generate longer answers, Kimi K2 Instruct or GPT-6 Astra?+
Neither has a larger sourced maximum output. Kimi K2 Instruct is — and GPT-6 Astra is 128K.
Do Kimi K2 Instruct and GPT-6 Astra support reasoning and tool use?+
Kimi K2 Instruct: tool calling. GPT-6 Astra: 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-6 Astra?+
Kimi K2 Instruct has 2 sourced provider routes; GPT-6 Astra has 2, a tie.
Which offers better value, Kimi K2 Instruct or GPT-6 Astra?+
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.