Decision summary
- New Meta API default -> Muse Spark 1.3
- Unchanged Muse Code install -> Muse Spark 1.2 until you switch it
- Audio in the prompt -> Muse Spark 1.2 or Muse Voice Transcribe
- Max reasoning on Standard -> Muse Spark 1.3
- Open weights -> neither; see Muse Glimmer
Muse Spark successor comparison
Frontier comparisonMuse Spark 1.3 vs Muse Spark 1.2
Muse Spark 1.3 is Meta's September 2, 2026 hosted coding and agent checkpoint; Muse Spark 1.2 remains the previous version and the documented Muse Code default.
Featured · Updated 6 weeks ago · Last verified: September 2026
Choose Muse Spark 1.3 when
New Meta Model API and Muse Code routes that need the current agent/coding checkpoint.
Choose Muse Spark 1.2 when
Pinned 1.2 production and Muse Code installs that have not switched the default.
- New Meta API default: Muse Spark 1.3
- Unchanged Muse Code install: Muse Spark 1.2 until you switch it
- Audio in the prompt: Muse Spark 1.2 or Muse Voice Transcribe
Decision axes: Best for · Access and platforms · Context window · Input and output
Reasoning
1.3 adds Standard-tier max. 1.2 is the prior effort surface.
Coding
Rematch Muse Code and your own harness; do not trust a single internal token-savings figure.
Multimodal
Avoid 1.3 for audio understanding. Use 1.2 or Muse Voice Transcribe.
Speed
Meta claims fewer tools and tokens on 1.3. Measure end-to-end.
Enterprise
Contributor IDs trade price for training rights on both versions.
Curated matrix for Muse Spark 1.3 vs Muse Spark 1.2 — confirm live limits and pricing on each vendor’s official pages.
How they compare
Criterion-by-criterion notes from the catalog—not a ranking. Validate on your own gold set.
| Criterion | Muse Spark 1.3 | Muse Spark 1.2 |
|---|---|---|
| Best for | New Meta Model API and Muse Code routes that need the current agent/coding checkpoint. | Pinned 1.2 production and Muse Code installs that have not switched the default. |
| Access and platforms | API ID muse-spark-1.3 in Muse Code and Meta Model API. Contributor ID muse-spark-1.3-contributor. | API ID muse-spark-1.2; still current in this catalog, no longer latest Spark. |
| Context window | 1,048,576 tokens. Text, image, video, PDF in; text out. | Same 1M-class window as 1.3. |
| Input and output | Text, image, video, PDF in; text out. Audio understanding is not fully supported on 1.3. | Text, image, video, audio, PDF in; text out. Prefer 1.2 or Muse Voice Transcribe for audio. |
| Reasoning control | All documented effort levels, including max on Standard tier only. | Prior Spark effort levels; no 1.3 max-on-Standard story. |
| Coding and agents | Recommended for new work. Meta cites ~20% fewer tool calls and ~25% fewer tokens vs 1.2 in internal comparisons. | Still the documented Muse Code default until you change it. |
| Cost posture | Standard $1.25 / $0.15 cached / $4.25 output per 1M. Contributor $0.10 / $0.002 / $0.20 with training-data terms. | Same Standard list as 1.3. |
| Operational risk | Muse Code overview still defaults to 1.2. Closed weights. Contributor tier is a different data-use contract. | Do not assume 1.3 behavior on a 1.2 pin. Open-weight Spark remains a roadmap item, not this ID. |
Key insights
Concrete technical or product signals.
- This is a same-family upgrade, not Spark vs Astra or Gemini 3.8 Flash.
- Standard list price does not change; token count per task might.
- Use Muse Voice Transcribe instead of either Spark ID for dedicated ASR.
Use cases
Where this shines in production.
- Deciding whether to bump Meta Spark defaults
- Keeping a Muse Code 1.2 pin
- Choosing Standard vs Contributor IDs
Limitations & trade-offs
What to watch for.
- Not Spark 1.3 vs GPT-6 Astra.
- Vendor efficiency numbers are Meta-internal.
- Muse Agent the consumer app is not this comparison.
Watch-outs
Who should pass, and what to validate before rollout.
- Do not delete 1.2 on day one.
- Do not pick 1.3 for production ASR.
- Do not treat this as Muse Agent vs Claude.
Final recommendation
What to do after reading the table.
Make 1.3 the API default this week. Flip Muse Code after one repo bakeoff. Keep 1.2 as a pin.
FAQ
Is Muse Spark 1.3 better than Muse Spark 1.2?
Make 1.3 the API default this week. Flip Muse Code after one repo bakeoff. Keep 1.2 as a pin.
Which is better for coding: Muse Spark 1.3 or Muse Spark 1.2?
Muse Spark 1.3: Recommended for new work. Meta cites ~20% fewer tool calls and ~25% fewer tokens vs 1.2 in internal comparisons. Muse Spark 1.2: Still the documented Muse Code default until you change it. The catalog does not declare a winner on coding and agents.
Which is cheaper: Muse Spark 1.3 or Muse Spark 1.2?
Listed unit prices: Muse Spark 1.3 Standard $1.25 / $0.15 cached / $4.25 output per 1M. Contributor $0.10 / $0.002 / $0.20 with training-data terms; Muse Spark 1.2 Same Standard list as 1.3. A lower listed unit price is not the same as a lower total workload cost—tokens, session minutes, caching, introductory rates, and add-on modes can reverse the ranking. Confirm live rates on each vendor’s official page.
Can I use both Muse Spark 1.3 and Muse Spark 1.2?
Yes. Many teams keep both and route by constraint. Use Muse Spark 1.3 for New Meta Model API and Muse Code routes that need the current agent/coding checkpoint, and Muse Spark 1.2 for Pinned 1.2 production and Muse Code installs that have not switched the default. Confirm vendor terms before mixing them in one production workflow.