GPT-5.6 Luna vs Muse Spark 1.1: Specs & Benchmark Comparison
GPT-5.6 Luna is developed by OpenAI, while Muse Spark 1.1 comes from Meta. Both were released in July 2026.
The two models share 4 published benchmarks. GPT-5.6 Luna leads on 3 of them, Muse Spark 1.1 on 1. The widest gaps are on Toolathlon, where Muse Spark 1.1 scores 75.6% against 53.4%; DeepSWE 1.1, where GPT-5.6 Luna scores 67.0% against 53.0%. Averaged across everything we track, GPT-5.6 Luna sits at 51.5% and Muse Spark 1.1 at 70.7%.
GPT-5.6 Luna is the cheaper API at $0.20 per million input tokens and $1.20 per million output tokens, roughly 6 times cheaper than Muse Spark 1.1 at $1.25 and $4.25. Both accept a context window of about 1M tokens. Both accept text and images as input.
| Characteristic | GPT-5.6 Luna | Muse Spark 1.1 |
|---|---|---|
| Company | OpenAI | Meta |
| Release Date | July 9, 2026 | July 9, 2026 |
| Parameters | — | — |
| Multimodal | Yes | Yes |
| Context (input) | 1.1M | 1.0M |
| Context (output) | 128K | 131K |
| Input Price / 1M | $0.20 | $1.25 |
| Output Price / 1M | $1.20 | $4.25 |
| Average Score | 51.5% | 70.7% |
| Benchmarks | ||
| Toolathlon | 53.4% | 75.6% |
| DeepSWE 1.1 | 67.0% | 53.0% |
| Terminal-Bench 2.1 | 84.7% | 80.0% |
| SWE-Bench Pro | 62.7% | 61.5% |
Visual Benchmark Comparison
Verdict
GPT-5.6 Luna leads in 2 out of 4 comparison categories.
Both models show comparable average scores: GPT-5.6 Luna — 0.5, Muse Spark 1.1 — 0.7.
GPT-5.6 Luna is 3.9x cheaper: input $0.20/1M vs $1.25/1M tokens.
GPT-5.6 Luna supports a larger context: 1M vs 1M tokens.
Both models were released around the same time: 7/9/2026 and 7/9/2026.
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Frequently Asked Questions
Which is better for coding — GPT-5.6 Luna or Muse Spark 1.1?
Which model is cheaper — GPT-5.6 Luna or Muse Spark 1.1?
Which has a larger context window — GPT-5.6 Luna or Muse Spark 1.1?
The GPT-5.6 Luna and Muse Spark 1.1 comparison is updated for 2026. Data includes benchmark results, API pricing, context window size and other specifications. For more detailed information, visit the GPT-5.6 Luna or Muse Spark 1.1 page. See also the complete list of AI model comparisons.