GPT-4.1 Nano vs GPT-5.6 Luna
Benchmark Performance
Available Benchmarks
| Benchmark | GPT-4.1 Nano | GPT-5.6 Luna |
|---|---|---|
| LMArena Text Arenatext-2026-09-01-011508720696 · arena_rating · leader | 1,284.6490% of row best · rating · gpt-4.1-nano-2025-04-14; 95% CI [1276.99177350, 1292.27849322]; votes 6103; rank 246 | 1,430.14100% of row best · rating · gpt-5.6-luna-xhigh; 95% CI [1425.14784950, 1435.13857729]; votes 24433; rank 82 |
| LMArena Vision Arenavision-2026-08-27-011508720696 · arena_rating · leader | 1,063.2385% of row best · rating · gpt-4.1-nano-2025-04-14; 95% CI [1044.95116252, 1081.50991534]; votes 1211; rank 120 | 1,254.30100% of row best · rating · gpt-5.6-luna-xhigh; 95% CI [1245.05722338, 1263.53552757]; votes 5857; rank 45 |
| Overall ResultCounted from the protocol-matched rows above | 0 benchmark wins | 2 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.
Technical Differences
Side-by-Side Facts
| Field | GPT-4.1 Nano | GPT-5.6 Luna |
|---|---|---|
| Developer | OpenAI | OpenAI |
| Family | Gpt 4 1 | Gpt 5 6 |
| Model | GPT-4.1 Nano | GPT-5.6 Luna |
| Version | GPT-4.1 Nano | GPT-5.6 Luna |
| Lifecycle | active | active |
| Released | Unknown | Unknown |
| Knowledge cutoff | 2024-06-01 | 2026-02-16 |
| Input modalities | Text, Image | Text, Image |
| Output modalities | Text | Text |
| Context window | 1,047,576 | 1,050,000 |
| 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, tools | chat, generation, reasoning, tools |
14 comparable fields · 6 material differences · Pair passes the primary-source comparison gate
GPT-4.1 Nano Capabilities
GPT-5.6 Luna Capabilities
Internal Comparison Graph
Related Comparisons
| A | Pair | B | Context |
|---|---|---|---|
GPT-4.1OpenAI | vs | GPT-5.6 LunaOpenAI | family variantsimage, text |
GPT-4.1 MiniOpenAI | vs | GPT-5.6 LunaOpenAI | family variantsimage, text |
GPT-4.1 NanoOpenAI | vs | GPT-4oOpenAI | family variantsimage, text |
GPT-4.1 NanoOpenAI | vs | GPT-4o MiniOpenAI | family variantsimage, text |
GPT-4oOpenAI | vs | GPT-5.6 LunaOpenAI | family variantsimage, text |
GPT-4.1 NanoOpenAI | vs | GPT-5.6 SolOpenAI | family variantsimage, text |
 Mistral-Small-4-119B-2603Mistral AI | vs | GPT-5.6 LunaOpenAI | cross-developer peersimage, text |
Claude Fable 5Anthropic | vs | GPT-5.6 LunaOpenAI | cross-developer peersimage, text |
Claude Fable 5.1Anthropic | vs | GPT-5.6 LunaOpenAI | cross-developer peersimage, text |
Claude Mythos 5.1Anthropic | vs | GPT-5.6 LunaOpenAI | cross-developer peersimage, text |
Claude Opus 4.8Anthropic | vs | GPT-5.6 LunaOpenAI | cross-developer peersimage, text |
Claude Opus 5Anthropic | vs | GPT-5.6 LunaOpenAI | cross-developer peersimage, text |
Primary Evidence
Sources and Freshness
Questions
GPT-4.1 Nano vs GPT-5.6 Luna FAQs
Is GPT-4.1 Nano or GPT-5.6 Luna better for coding?+
This comparison does not currently contain a protocol-matched coding benchmark for both GPT-4.1 Nano 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-4.1 Nano or GPT-5.6 Luna?+
GPT-4.1 Nano is $0.050 and GPT-5.6 Luna is $0.20 per million tokens, so GPT-4.1 Nano is cheaper on this metric. GPT-4.1 Nano is $0.20 and GPT-5.6 Luna is $1.20 per million tokens, so GPT-4.1 Nano is cheaper on this metric.
Which has a larger context window, GPT-4.1 Nano or GPT-5.6 Luna?+
GPT-5.6 Luna has the larger sourced context window. GPT-4.1 Nano supports 1,047,576 and GPT-5.6 Luna supports 1,050,000.
Which performs better in benchmarks, GPT-4.1 Nano 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-4.1 Nano or GPT-5.6 Luna be self-hosted?+
Both models have the same recorded self-hosting status: unsupported. GPT-4.1 Nano is not marked open weight; GPT-5.6 Luna is not marked open weight.
Can GPT-4.1 Nano and GPT-5.6 Luna understand images?+
GPT-4.1 Nano 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-4.1 Nano or GPT-5.6 Luna?+
GPT-5.6 Luna has the larger sourced maximum output: GPT-4.1 Nano supports 32,768 and GPT-5.6 Luna supports 128,000 output tokens.
Do GPT-4.1 Nano and GPT-5.6 Luna support reasoning and tool use?+
GPT-4.1 Nano: 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-4.1 Nano or GPT-5.6 Luna?+
GPT-4.1 Nano has 2 sourced provider routes; GPT-5.6 Luna has 2, a tie.
Which offers better value, GPT-4.1 Nano 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.