Muse Spark 1.2vsGPT-5.3-Codex-Spark
Muse Spark 1.2 | GPT-5.3-Codex-Spark | |
|---|---|---|
| Specifications | ||
Context window | 1M | 128k |
| Benchmarks | ||
Agentic coding DeepSWE 1.1Artificial Analysis' independent test of deep, agentic software-engineering work — the AI has to plan and carry out substantial coding tasks end to end. (Version 1.1 of the test.) Higher is better. | 59.3% | — |
Agentic terminal coding Terminal-Bench 2.1Can the AI work in a command-line terminal — running commands and finishing technical setup tasks the way a developer would? Higher is better. | 82.9% | — |
| Overview | ||
| Company | Meta | OpenAI |
| Release date | Aug 5 2026 | Feb 12 2026 |
| Access | Proprietary | Proprietary |
Which is better: Muse Spark 1.2 or GPT-5.3-Codex-Spark?
Muse Spark 1.2 and GPT-5.3-Codex-Spark don't publish scores on any of the same benchmarks, so there's no direct head-to-head comparison. GPT-5.3-Codex-Spark shipped 174 days before Muse Spark 1.2, so benchmark comparisons should account for the intervening progress.
Context windows are 1M (Muse Spark 1.2) vs 128k (GPT-5.3-Codex-Spark).
Direct benchmark comparisons are unavailable — Muse Spark 1.2 and GPT-5.3-Codex-Spark don't publish scores on any of the same benchmarks.
Frequently asked questions
Muse Spark 1.2 was released by Meta on Aug 5 2026.
GPT-5.3-Codex-Spark was released by OpenAI on Feb 12 2026.
Muse Spark 1.2 has a 1M context window; GPT-5.3-Codex-Spark has 128k.
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