Muse Spark 1.2vsGrok 4.3 Beta
Muse Spark 1.2 | Grok 4.3 Beta | |
|---|---|---|
| Specifications | ||
Context windowHow much text the model can hold in mind at once — your question, any documents you attach, the conversation so far, and its own reply. Go past it and the earliest part falls out of view. | 1M | — |
| API pricingUSD per 1M tokens · lower wins | ||
Cheapest inputLowest input rate across third-party providers, excluding the lab itself. The cheapest endpoint may run a quantised build or a shorter context — see "Available from" on the model page. | $1.25Meta | — |
Cheapest outputLowest output rate across third-party providers, excluding the lab itself. May come from a different provider than the cheapest input. | $4.25Meta | — |
| Benchmarks | ||
BullshitBench v2Nonsense detection — Given a confidently-worded but nonsensical prompt, does the AI spot that it makes no sense and push back — instead of playing along and inventing an answer? The score is how often it clearly called out the nonsense. Higher is better. | 50% | 50% |
| BenchmarksPublished by one model only | ||
DeepSWE 1.1Agentic coding — Artificial 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% | — |
Terminal-Bench 2.1Agentic terminal coding — Can 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 | SpaceXAI |
| Release date | Aug 5 2026 | Apr 17 2026 |
| Access | Proprietary | Proprietary |
Other comparisons
Muse Spark 1.2vsClaude Fable 5.1Grok 4.3 BetavsClaude Fable 5.1Muse Spark 1.2vsGPT-6 AstraGrok 4.3 BetavsGPT-6 AstraMuse Spark 1.2vsGemini 3.8 FlashGrok 4.3 BetavsGemini 3.8 FlashMuse Spark 1.2vsDeepSeek-V4-Pro-0813Grok 4.3 BetavsDeepSeek-V4-Pro-0813Muse Spark 1.2vsMistral Medium 3.5Grok 4.3 BetavsMistral Medium 3.5Muse Spark 1.2vsKimi K3Grok 4.3 BetavsKimi K3
Frequently asked questions
Muse Spark 1.2 and Grok 4.3 Beta are evenly matched across the 1 benchmark they both report (BullshitBench v2). Grok 4.3 Beta shipped 110 days before Muse Spark 1.2, so benchmark comparisons should account for the intervening progress.
Published specifications for these two models are limited — see each model page for the latest details.
On BullshitBench v2, both models score 50%.