$ diff gpt-5-6-sol muse-spark
GPT-5.6 Sol vs Muse Spark
OpenAI and Meta AI, side by side. Every value below is the one recorded on the model’s own wiki page, with its citation — nothing is estimated.
OpenAIGPT-5.6 Sol
- context
- 1.1M
- weights
- closed
- $/M in
- $5
- $/M out
- $30
- context
- 1M
- weights
- open
- $/M in
- $1.25
- $/M out
- $4.25
What actually differs
- Context window
- GPT-5.6 Sol takes 1.1M against 1M — modestly more room in a single request.
- Input price
- Muse Spark at $1.25/M against $5/M — 4.0× cheaper to feed.
- Output price
- Muse Spark at $4.25/M against $30/M — 7.1× cheaper to generate. Output dominates the bill on most agentic workloads, where the model writes far more than it reads.
- Weights
- Muse Spark publishes weights (proprietary (closed / API-only, not open-weights)); GPT-5.6 Sol is API-only. That decides self-hosting, air-gapped deployment and fine-tuning before any capability question does.
- Recency
- GPT-5.6 Sol shipped 92 days after Muse Spark (2026-07-09 vs 2026-04-08).
Full spec
| Attribute | GPT-5.6 Sol | Muse Spark |
|---|---|---|
| Developer | OpenAI | Meta AI |
| Released | 2026-07-09 | 2026-04-08 |
| Context window | 1.05M tokens | 1,000,000 tokens (1.1) |
| Pricing | $5/M input · $30/M output (Sol; family tiers below) | $1.25/M input · $4.25/M output (Meta Model API, public preview) |
| License | proprietary (API-only; no weight release) | proprietary (closed / API-only, not open-weights) |
| Availability | ChatGPT (subscription), API | Meta Model API (public preview, US-based developers only) |
Values come from GPT-5.6 Sol and Muse Spark, 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. How these pages are produced.