Kimi K3 vs GPT-5.6 Luna
At a Glance
| Compare |  Kimi K3Moonshot AI |  GPT-5.6 LunaOpenAI |
|---|---|---|
| Intelligence, Cost, and Efficiency | ||
| IntelligenceHigher is better · MM Intelligence v2.5 | #17 of 4670.3 score · 3/3 sources · complete | #31 of 4652.7 score · 3/3 sources · complete |
| CostLower is better · Published-token output estimate | #30 of 44$0.194 per LiveBench case | #6 of 44$0.026 per LiveBench case |
| EfficiencyHigher is better · MM Efficiency v1.5 | #21 of 3852.5 score · 3/3 sources · complete | #4 of 3864.8 score · 3/3 sources · complete |
| Pricing and Limits | ||
| Input priceFrom · USD / 1M tokens | $2.85Deepinfra ↗ · Sep 21, 2026 | $0.20Openai ↗ · Sep 3, 2026 |
| Output priceFrom · USD / 1M tokens | $14.25Deepinfra ↗ · Sep 21, 2026 | $1.20Openai ↗ · Sep 3, 2026 |
| Context windowMaximum documented tokens | 1,049K | 1,050K |
| Model facts checked | Aug 28, 2026View model evidence → | Aug 28, 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-K3 | GPT-5.6 Luna |
|---|---|---|
| ARC-AGI-1verified-v1-ba05d69f6453 · verified_score · leader | 94.50100% of row best · percent · Kimi K3 (Max) | 90.6796% of row best · percent · GPT-5.6 Luna 2026-07-30 (Max) |
| ARC-AGI-2verified-v2-6c676fa3e9af · verified_score · leader | 60.42100% of row best · percent · Kimi K3 (Max) | 59.5899% of row best · percent · GPT-5.6 Luna 2026-07-30 (Max) |
| LMArena Agent Arenaagent-2026-09-15-d25aabda0010 · outcome_score · leader | 6.22100% of row best · score · Kimi K3 (Max); 95% CI [5.59393783, 6.84323085]; sessions 108615; observations 9086177; rank 8 | -0.4494% of row best · score · GPT 5.6 Luna (xHigh); 95% CI [-1.27310649, 0.39719069]; sessions 29186; observations 2307801; rank 27 |
| LMArena Text Arenatext-2026-09-13-d25aabda0010 · arena_rating · leader | 1,472.27100% of row best · rating · kimi-k3-max; 95% CI [1467.05577758, 1477.48944277]; votes 20987; rank 23 | 1,429.8997% of row best · rating · gpt-5.6-luna-xhigh; 95% CI [1425.11549148, 1434.66063238]; votes 28547; rank 86 |
| LiveBench2026-06-25 · overall · leader | 81.02100% of row best · percent · kimi-k3 · 13,647 output tokens / case | 77.0595% of row best · percent · gpt-5.6-luna-max · 21,799 output tokens / case |
| ToneBench2026-09-11-10-task-4ef099199c9c · overall_score · unverified | 88.19100% of row best · points · Kimi K3 · 15,023 output tokens / case | 84.4796% of row best · points · GPT-5.6 Luna (ultra) · 17,605 output tokens / case |
| Overall ResultCounted from the protocol-matched rows above | 5 benchmark winsOverall lead | 0 benchmark wins |
Third-party benchmark Only like-for-like primary-publisher results are shown; raw scores, relative scores, configuration, and token spend remain visible.
Quality Versus Estimated Output Cost
Side-by-Side Facts
| Field | Kimi-K3 | GPT-5.6 Luna |
|---|---|---|
| Developer | Moonshot AI | OpenAI |
| Family | Kimi K3 | Gpt 5 6 |
| Model | Kimi-K3 | GPT-5.6 Luna |
| Version | Kimi-K3 | GPT-5.6 Luna |
| Lifecycle | active | active |
| Released | 2026-07-16 | Unknown |
| Knowledge cutoff | Unknown | 2026-02-16 |
| Input modalities | Text, Image | Text, Image |
| Output modalities | Text | Text |
| Context window | 1,049K | 1,050K |
| Total parameters | 2.8T | Unknown |
| Active parameters | 104B | Unknown |
| License | other | Unknown |
| Open weights | Yes | No |
| API available | Yes | Yes |
| Self-hostable | Yes | No |
| Provider access | Deepinfra (Standard), Fireworks Ai (Standard), Hugging Face (Standard), Openrouter (Standard), Together Ai (Standard) | Openai (Standard), Openrouter (Standard) |
| Capabilities | chat, generation, reasoning | chat, generation, reasoning, tools |
Kimi K3 Capabilities
GPT-5.6 Luna Capabilities
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Primary Evidence
Sources and Freshness
Questions
Kimi K3 vs GPT-5.6 Luna FAQs
Is Kimi K3 or GPT-5.6 Luna better for coding?+
This comparison does not currently contain a protocol-matched coding benchmark for both Kimi K3 and GPT-5.6 Luna, so Model Markets cannot name a coding leader from pricing, context size, or capability labels alone.
Which is cheaper, Kimi K3 or GPT-5.6 Luna?+
Kimi K3 is $2.85 and GPT-5.6 Luna is $0.20 per million tokens, so GPT-5.6 Luna is cheaper on this metric. Kimi K3 is $14.25 and GPT-5.6 Luna is $1.20 per million tokens, so GPT-5.6 Luna is cheaper on this metric.
Which has a larger context window, Kimi K3 or GPT-5.6 Luna?+
GPT-5.6 Luna has the larger sourced context window. Kimi K3 supports 1,049K and GPT-5.6 Luna supports 1,050K.
Which performs better in benchmarks, Kimi K3 or GPT-5.6 Luna?+
Kimi K3 leads the current overall benchmark count. The result uses 5 protocol-matched benchmarks from 3 publishers; it is not a universal quality score.
Can Kimi K3 or GPT-5.6 Luna be self-hosted?+
Kimi K3 is the only model in this pair currently marked as self-hostable. Kimi K3 is open weight; GPT-5.6 Luna is not marked open weight.
Can Kimi K3 and GPT-5.6 Luna understand images?+
Kimi K3 is documented with image input; GPT-5.6 Luna is documented with image input. This reflects supported input modalities, not vision quality.
Which can generate longer answers, Kimi K3 or GPT-5.6 Luna?+
Neither has a larger sourced maximum output. Kimi K3 is — and GPT-5.6 Luna is 128K.
Do Kimi K3 and GPT-5.6 Luna support reasoning and tool use?+
Kimi K3: reasoning and image input. GPT-5.6 Luna: reasoning, tool calling, and image input. Feature support does not establish relative quality.
Which is available from more inference providers, Kimi K3 or GPT-5.6 Luna?+
Kimi K3 has 5 sourced provider routes; GPT-5.6 Luna has 2, so Kimi K3 has broader tracked availability.
Which offers better value, Kimi K3 or GPT-5.6 Luna?+
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.