Muse Spark 1.3 vs GPT-6 Sol
Muse Spark 1.3 costs $1.25 / $4.25 and GPT-6 Sol costs $2.00 / $10.00 per million input / output tokens. At a typical 3:1 mix, Muse Spark 1.3 is 2.0× cheaper than GPT-6 Sol.
Input
$1.25
per 1M
Output
$4.25
per 1M
Cached
$0.15
1M context
GPT-6 Sol
OpenAI
Input
$2.00
per 1M
Output
$10.00
per 1M
Cached
$0.20
1.05M context
Side by side
Green marks the cheaper price, larger context window, bigger discount or higher score.
| Detail | Muse Spark 1.3 | GPT-6 Sol |
|---|---|---|
| Input per 1M | $1.25 | $2.00 |
| Output per 1M | $4.25 | $10.00 |
| Blended per 1M (3:1) | $2.00 | $4.00 |
| Cached input per 1M | $0.15 | $0.20 |
| Batch or off-peak discount | None | 50% (batch) |
| Long prompts | Same rate at any length | Over 272K: 2× in, 1.5× out |
| Context window | 1M | 1.05M |
| Released | 2 Sep 2026 | 22 Sep 2026 |
| Open weights | No | No |
| Verified | 27 Sep 2026 | 27 Sep 2026 |
Sources: Meta pricing and OpenAI pricing.
Monthly cost on three workloads
List prices, no batch discount. The cached share applies where a model has a cache rate.
| Workload | Muse Spark 1.3 | GPT-6 Sol | Difference |
|---|---|---|---|
| Customer chat assistant50,000 conversations a month, about 2,000 tokens in and 400 out each; 50% cached | $155 | $310 | $155 |
| Document Q&A (RAG)20,000 questions a month over retrieved documents, 12,000 in and 600 out; 30% cached | $272 | $470 | $199 |
| Coding agent400 tasks a month, 40 steps each with a growing context; 85% cached | $270 | $433 | $162 |
How they differ
- Muse Spark 1.3 is cheaper on input ($1.25 vs $2).
- Muse Spark 1.3 is cheaper on output ($4.25 vs $10), which matters most for long answers and reasoning models.
- GPT-6 Sol accepts longer prompts (1.05M vs 1M tokens).
- Cached input is cheaper on Muse Spark 1.3 ($0.15 vs $0.20), which favours agents and chat apps that resend the same context.
- Only GPT-6 Sol offers a batch discount for jobs that can wait.
Recent changes
All changes- OpenAI launched GPT-6 Sol at $2 / $10 and GPT-6 Luna at $0.10 / $0.50.
- OpenAI launched GPT-6 Astra at $10 / $50, its most expensive standard model.
- Meta released Muse Spark 1.3 at $1.25 / $4.25.
- Meta released Muse Glimmer 30B as open weights under Apache 2.0.
