GPT-5.4 Pro vs GPT-5.6 Luna
At a Glance
| Compare |  GPT-5.4 ProOpenAI | GPT-5.6 LunaOpenAI |
|---|---|---|
| Pricing and Limits | ||
| Input priceFrom · USD / 1M tokens | $30.00Openai ↗ · Sep 3, 2026 | $0.20Openai ↗ · Sep 3, 2026 |
| Output priceFrom · USD / 1M tokens | $180.00Openai ↗ · Sep 3, 2026 | $1.20Openai ↗ · Sep 3, 2026 |
| Context windowMaximum documented tokens | 1,050K | 1,050K |
| Model facts checked | Sep 3, 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 | GPT-5.4 Pro | GPT-5.6 Luna |
|---|---|---|
| ARC-AGI-1verified-v1-613c385b0c93 · verified_score · leader | 94.50100% of row best · percent · GPT-5.4 Pro (XHigh) | 90.6796% of row best · percent · GPT-5.6 Luna 2026-07-30 (Max) |
| ARC-AGI-2verified-v2-be40992860f9 · verified_score · leader | 83.33100% of row best · percent · GPT-5.4 Pro (XHigh) | 59.5872% of row best · percent · GPT-5.6 Luna 2026-07-30 (Max) |
| Overall ResultCounted from the protocol-matched rows above | 2 benchmark winsNo 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 | GPT-5.4 Pro | GPT-5.6 Luna |
|---|---|---|
| Developer | OpenAI | OpenAI |
| Family | Gpt 5 4 | Gpt 5 6 |
| Model | GPT-5.4 Pro | GPT-5.6 Luna |
| Version | GPT-5.4 Pro | GPT-5.6 Luna |
| Lifecycle | active | active |
| Released | 2026-03-05 | Unknown |
| Knowledge cutoff | 2025-08-31 | 2026-02-16 |
| Input modalities | Text, Image | Text, Image |
| Output modalities | Text | Text |
| Context window | 1,050K | 1,050K |
| 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) | Openai (Standard), Openrouter (Standard) |
| Capabilities | chat, generation, reasoning, structured_outputs, tools | chat, generation, reasoning, tools |
GPT-5.4 Pro Capabilities
GPT-5.6 Luna Capabilities
Related Comparisons
All image comparisons →| A | Pair | B | Context |
|---|---|---|---|
 DeepSeek-V4.1-FlashDeepSeek | vs | GPT-5.4 ProOpenAI | cross-developer peersimage, text |
GPT-5.4 ProOpenAI | vs | Grok 4.6xAI | cross-developer peersimage, text |
Claude Sonnet 5Anthropic | vs | GPT-5.4 ProOpenAI | cross-developer peersimage, text |
 Gemini 3.8 FlashGoogle DeepMind | vs | GPT-5.4 ProOpenAI | cross-developer peerstext |
GPT-5.4 ProOpenAI | vs | GPT-5.6 TerraOpenAI | family variantsimage, text |
Claude Opus 4.6Anthropic | vs | GPT-5.4 ProOpenAI | cross-developer peersimage, text |
Claude Opus 5Anthropic | vs | GPT-5.4 ProOpenAI | cross-developer peersimage, text |
Claude Sonnet 4.6Anthropic | vs | GPT-5.4 ProOpenAI | cross-developer peersimage, text |
GPT-5.4 ProOpenAI | vs | GPT-5.5OpenAI | family variantsimage, text |
GPT-5.4 ProOpenAI | vs | cross-developer peersimage, text |
Primary Evidence
Sources and Freshness
Questions
GPT-5.4 Pro vs GPT-5.6 Luna FAQs
Is GPT-5.4 Pro or GPT-5.6 Luna better for coding?+
This comparison does not currently contain a protocol-matched coding benchmark for both GPT-5.4 Pro and GPT-5.6 Luna, so Model Markets cannot name a coding leader from pricing, context size, or capability labels alone.
Which is cheaper, GPT-5.4 Pro or GPT-5.6 Luna?+
GPT-5.4 Pro is $30.00 and GPT-5.6 Luna is $0.20 per million tokens, so GPT-5.6 Luna is cheaper on this metric. GPT-5.4 Pro is $180.00 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, GPT-5.4 Pro or GPT-5.6 Luna?+
Both models have the same sourced context window: 1,050,000 tokens each.
Which performs better in benchmarks, GPT-5.4 Pro or GPT-5.6 Luna?+
There is no overall benchmark winner: An overall winner requires at least two decisive benchmarks from at least two original publishers.
Can GPT-5.4 Pro or GPT-5.6 Luna be self-hosted?+
Both models have the same sourced self-hosting status: unsupported. GPT-5.4 Pro is not marked open weight; GPT-5.6 Luna is not marked open weight.
Can GPT-5.4 Pro and GPT-5.6 Luna understand images?+
GPT-5.4 Pro 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, GPT-5.4 Pro or GPT-5.6 Luna?+
Both models have the same sourced maximum output: 128,000 tokens each.
Do GPT-5.4 Pro and GPT-5.6 Luna support reasoning and tool use?+
GPT-5.4 Pro: reasoning, tool calling, 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, GPT-5.4 Pro or GPT-5.6 Luna?+
GPT-5.4 Pro has 2 sourced provider routes; GPT-5.6 Luna has 2, a tie.
Which offers better value, GPT-5.4 Pro 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.