$ diff muse-spark-1-2 grok-4-5
Muse Spark 1.2 vs Grok 4.5
Values come from Muse Spark 1.2 and Grok 4.5, where each is cited to its source. This page states no benchmark result and ranks neither model — it puts two published specifications next to each other. Where a lab has not published a figure, the row says so rather than guessing.
Meta AIMuse Spark 1.2
- context
- 1M
- weights
- —
- $/M in
- $1.25
- $/M out
- $4.25
- context
- 500K
- weights
- —
- $/M in
- $2
- $/M out
- $6
What actually differs
- Context window
- Muse Spark 1.2 takes 1M against 500K — 2× more room in a single request.
- Input price
- Muse Spark 1.2 at $1.25/M against $2/M — 1.6× cheaper to feed. Standard rates: one of these labs also quotes a lower cached-input tier, which applies only when a prefix is reused — see the full spec below.
- Output price
- Muse Spark 1.2 at $4.25/M against $6/M — 1.4× cheaper to generate. Output dominates the bill on most agentic workloads, where the model writes far more than it reads.
- Recency
- Muse Spark 1.2 shipped 27 days after Grok 4.5 (2026-08-05 vs 2026-07-09).
Full spec
| Attribute | Muse Spark 1.2 | Grok 4.5 |
|---|---|---|
| Developer | Meta AI | xAI |
| Released | 2026-08-05 | 2026-07-09 |
| Context window | 1,000,000 | 500K tokens |
| Pricing | $1.25/M input · $4.25/M output · $0.15/M cached input | $2/M input · $6/M output |
| License | not recorded | not recorded |
| Availability | Muse Code (beta, macOS + Linux), Meta Model API | Grok Build (default model), Cursor (all plans), SpaceXAI console/API; not in EU (regulatory review pending as of 2026-07-09) |