Muse Spark Open vs GPT-5.3 Codex
Rank, tier, score and price side by side, from our weekly rankings. Scores are editorial opinion based on public sources.
A
Muse Spark Open
B
GPT-5.3 Codex
- ProviderMetaOpenAI
- Rank#36#32Higher rank
- TierAA
- Score82.382.9Higher score
- PriceOpen weights (Muse Model License); hosted APIs around $1.25 input / $4.25 output per 1M tokensLower price tierAPI $1.75 input / $14 output per 1M tokens
- TaglineMeta's 816B-parameter open-weight mixture-of-experts reasoning model (October 2026) aimed at coding agents and tool use.OpenAI's February 2026 agentic coding model combining code generation with general-purpose intelligence, since folded into GPT-5.4 and followed by the GPT-5.5 and GPT-5.6 families.
| Attribute | Muse Spark Open | GPT-5.3 Codex |
|---|---|---|
| Provider | Meta | OpenAI |
| Rank | #36 | #32Higher rank |
| Tier | A | A |
| Score | 82.3 | 82.9Higher score |
| Price | Open weights (Muse Model License); hosted APIs around $1.25 input / $4.25 output per 1M tokensLower price tier | API $1.75 input / $14 output per 1M tokens |
| Tagline | Meta's 816B-parameter open-weight mixture-of-experts reasoning model (October 2026) aimed at coding agents and tool use. | OpenAI's February 2026 agentic coding model combining code generation with general-purpose intelligence, since folded into GPT-5.4 and followed by the GPT-5.5 and GPT-5.6 families. |