GPT-6 Luna vs Grok 4.6
At a Glance
| Compare |  GPT-6 LunaOpenAI | Grok 4.6xAI |
|---|---|---|
| Intelligence, Cost, and Efficiency | ||
| IntelligenceHigher is better · MM Intelligence v4.4 | #29 of 5742.3 score · 3/3 sources · complete | UnrankedNot in the 57-model eligible cohort |
| CostLower is better · Published-token output estimate | #4 of 27$0.018 per LiveBench case | UnrankedNot in the 27-model eligible cohort |
| EfficiencyHigher is better · MM Efficiency v1.9 | #10 of 2752.8 score · 3/3 sources · complete | UnrankedNot in the 27-model eligible cohort |
| Pricing and Limits | ||
| Input priceFrom · USD / 1M tokens | $0.10Openai ↗ · Sep 22, 2026 | $2.00Xai ↗ · Sep 3, 2026 |
| Output priceFrom · USD / 1M tokens | $0.50Openai ↗ · Sep 22, 2026 | $6.00Xai ↗ · Sep 3, 2026 |
| Context windowMaximum documented tokens | 1,050K | 500K |
| Model facts checked | Sep 22, 2026View model evidence → | Aug 29, 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 | GPT-6 Luna | Grok 4.6 |
|---|---|---|
| ARC-AGI-1verified-v1-613c385b0c93 · verified_score · leader | 86.6799% of row best · percent · GPT-6 Luna (Max) | 87.50100% of row best · percent · Grok 4.6 (Medium) |
| ARC-AGI-2verified-v2-be40992860f9 · verified_score · leader | 59.3188% of row best · percent · GPT-6 Luna (Max) | 67.08100% of row best · percent · Grok 4.6 (XHigh) |
| LMArena Text Arenatext-2026-10-15-0ebb411abf00 · arena_rating · leader | 1,391.6397% of row best · rating · gpt-6-luna-max; 95% CI [1387.01005073, 1396.24774606]; votes 49617; rank 166 | 1,427.77100% of row best · rating · grok-4.6-high; 95% CI [1422.91144511, 1432.61896218]; votes 28965; rank 99 |
| LiveBench2026-06-25-90f8d44da965 · overall · leader | 75.8492% of row best · percent · gpt-6-luna-max · 35,869 output tokens / case | 82.17100% of row best · percent · grok-4.6 · 16,154 output tokens / case |
| ToneBench2026-10-17-10-task-e9c76358afb2 · overall_score · unverified | 78.1997% of row best · points · GPT-6 Luna (max) · 6,595 output tokens / case | 80.33100% of row best · points · Grok 4.6 (high) · 21,440 output tokens / case |
| Overall ResultCounted from the protocol-matched rows above | 0 benchmark wins | 4 benchmark winsOverall lead |
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 | GPT-6 Luna | Grok 4.6 |
|---|---|---|
| Developer | OpenAI | xAI |
| Family | Gpt 6 | Grok 4 |
| Model | GPT-6 Luna | Grok 4.6 |
| Version | GPT-6 Luna | Grok 4.6 |
| Lifecycle | active | active |
| Released | 2026-09-22 | Unknown |
| Knowledge cutoff | 2026-05-18 | 2026-02-01 |
| Input modalities | Text, Image | Text, Image |
| Output modalities | Text | Text |
| Context window | 1,050K | 500K |
| Total parameters | Unknown | Unknown |
| Active parameters | Unknown | Unknown |
| License | Unknown | Unknown |
| Open weights | No | No |
| API available | Yes | Yes |
| Self-hostable | No | No |
| Provider access | Openai (Standard), Openrouter (Standard) | Xai (Standard) |
| Capabilities | chat, computer-use, generation, reasoning, tools | chat, generation, reasoning, tools |
| Default snapshot | gpt-6-luna | Unknown |
| Maximum input tokens | 922000 | Unknown |
| Reasoning effort | none, low, medium, high, xhigh, max | Unknown |
| Supported API routes | v1/responses, v1/chat/completions, v1/batch | Unknown |
GPT-6 Luna Capabilities
Grok 4.6 Capabilities
Related Comparisons
All image comparisons →| A | Pair | B | Context |
|---|---|---|---|
GPT-5.6 LunaOpenAI | vs | GPT-6 LunaOpenAI | family variantsimage, text |
 Gemini 3.1 Flash-LiteGoogle DeepMind | vs | GPT-6 LunaOpenAI | cross-developer peerstext |
Gemini 3.7 FlashGoogle DeepMind | vs | GPT-6 LunaOpenAI | cross-developer peerstext |
GPT-6 LunaOpenAI | vs | GPT-6 SolOpenAI | family variantsimage, text |
GPT-6 LunaOpenAI | vs |  Qwen3.8-FlashQwen | cross-developer peersimage, text |
Primary Evidence
Sources and Freshness
Questions
GPT-6 Luna vs Grok 4.6 FAQs
Is GPT-6 Luna or Grok 4.6 better for coding?+
This comparison does not currently contain a protocol-matched coding benchmark for both GPT-6 Luna and Grok 4.6, so Model Markets cannot name a coding leader from pricing, context size, or capability labels alone.
Which is cheaper, GPT-6 Luna or Grok 4.6?+
GPT-6 Luna is $0.10 and Grok 4.6 is $2.00 per million tokens, so GPT-6 Luna is cheaper on this metric. GPT-6 Luna is $0.50 and Grok 4.6 is $6.00 per million tokens, so GPT-6 Luna is cheaper on this metric.
Which has a larger context window, GPT-6 Luna or Grok 4.6?+
GPT-6 Luna has the larger sourced context window. GPT-6 Luna supports 1,050,000 tokens and Grok 4.6 supports 500,000 tokens.
Which performs better in benchmarks, GPT-6 Luna or Grok 4.6?+
Grok 4.6 leads the current overall benchmark count. The result uses 4 protocol-matched benchmarks from 3 publishers; it is not a universal quality score.
Can GPT-6 Luna or Grok 4.6 be self-hosted?+
Both models have the same sourced self-hosting status: unsupported. GPT-6 Luna is not marked open weight; Grok 4.6 is not marked open weight.
Can GPT-6 Luna and Grok 4.6 understand images?+
GPT-6 Luna is documented with image input; Grok 4.6 is documented with image input. This reflects supported input modalities, not vision quality.
Which can generate longer answers, GPT-6 Luna or Grok 4.6?+
GPT-6 Luna has a sourced maximum output of 128,000 tokens; Grok 4.6's maximum output is not reported. A larger limit cannot be determined.
Do GPT-6 Luna and Grok 4.6 support reasoning and tool use?+
GPT-6 Luna: reasoning, tool calling, and image input. Grok 4.6: reasoning, tool calling, and image input. Feature support does not establish relative quality.
Which is available from more inference providers, GPT-6 Luna or Grok 4.6?+
GPT-6 Luna has 2 sourced provider routes; Grok 4.6 has 1, so GPT-6 Luna has broader tracked availability.
Which offers better value, GPT-6 Luna or Grok 4.6?+
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.