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Muse Spark 1.3 vs GPT-6 Astra
GPT-6 Astra scores higher than Muse Spark 1.3 on all 6 public leaderboards that rate both. On the ArtificialWatch Index, which takes the median of each model's percentile across the boards that score it, Muse Spark 1.3 is at 81.4 and GPT-6 Astra at 91.5 (out of 100).
Scores as published by each board; table composed September 28, 2026.
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Leaderboard by leaderboard
| Board | Muse Spark 1.3 | GPT-6 Astra | Higher |
|---|---|---|---|
| LMArena Elo (community votes) | 1,655.5 | 1,791.7 | GPT-6 Astra |
| LiveBench global average (0-100) | 81.6 | 82.2 | GPT-6 Astra |
| SimpleBench AVG@5 % (private set) | 81.8 | 86.5 | GPT-6 Astra |
| LLM Stats LLM Stats Score · composite (0-100), their rendered top 15 | 53.8 | 59.5 | GPT-6 Astra |
| Vals AI Vals Index accuracy % · weighted finance + coding tasks | 64.5 | 66.6 | GPT-6 Astra |
| Artificial Analysis intelligence index · measured runs only | 48.1 | 52.7 | GPT-6 Astra |
Raw scores are each board's own scale, so compare within a row, not across rows. Full table: the bench index.
For coding
On the ArtificialWatch coding index, Muse Spark 1.3 is at 83.3 (#6 of 31) and GPT-6 Astra at 90 (#4). Muse Spark 1.3 scores higher on 1 of the 3 coding boards that rate both and GPT-6 Astra on 2.
| Coding board | Muse Spark 1.3 | GPT-6 Astra |
|---|---|---|
| LMArena · Coding | 1,538.7 | 1,542.3 |
| LiveBench · Coding | 72.6 | 68.8 |
| Vals Vibe Code Bench | 85.9 | 89.6 |
Muse Spark 1.3 at a glance
- Developer
- Meta
- Status
- Live since September 2, 2026
- API price
- $1.25 input / $4.25 output per 1M tokens · Meta, muse-spark-1.3
- Context window
- 1.05M tokens
Live — Sep 2 · $1.25/$4.25 per 1M and 1M ctx, identical to 1.2 · Meta: ~20% fewer tool calls, ~25% fewer tokens vs 1.2 · open weights on the roadmap, undated.
Muse Spark 1.3 is out — same price as 1.2, and the radar called it in 61 seconds
2026-09-03 · Meta released Muse Spark 1.3 today. Its own words: "We're excited to release Muse Spark 1.3, which delivers improved performance across agentic and coding tasks." The numbers Meta gives are efficiency, not capability: ~20% fewer tool calls and ~25% fewer tokens than 1.2 on coding work, fewer interaction turns, less…
GPT-6 Astra at a glance
- Developer
- OpenAI
- Status
- Live since September 3, 2026
- API price
- $10 input / $50 output per 1M tokens · OpenAI, gpt-6-astra
- Context window
- 1.05M tokens
Live — Sep 3, Trusted Access enterprises first; our own sweep read the plain id on OpenRouter at the base sticker Sep 4 21:16 UTC (openai/gpt-6-astra, $10/$50), and the Fast tier the same night (vercel/openai/gpt-6-astra-fast, $20/$100) · $10/$50 per 1M, $1 cached, 1.05M ctx / 128K out · AA Coding Agent Index 67 (≈ Opus 5, Fable 5), Intelligence Index 61 (= GPT-5.6 Sol, 5 below Fable 5.1).
GPT-6 Astra is out — Fable 5.1's sticker, trusted access first, public API within days
2026-09-03 · OpenAI shipped GPT-6 Astra today. Its own words, from the model documentation: "Our most capable model, built for the hardest end-to-end work" — complex reasoning, coding, computer use, research and document creation.
OpenAI is treating Astra as its first Critical cyber model — and slowing it down, 24 hours after the leaks said next week
2026-08-07 · Twenty-four hours ago both accounts we track said Astra was launching next week. Today OpenAI published that it is slowing the model down, and the reason outranks any launch calendar.
Muse Spark 1.3 vs GPT-6 Astra: quick answers
Which is better, Muse Spark 1.3 or GPT-6 Astra?
It depends on what you measure. GPT-6 Astra scores higher than Muse Spark 1.3 on all 6 public leaderboards that rate both. GPT-6 Astra's widest lead is on LLM Stats. On the ArtificialWatch Index, which takes the median of each model's percentile across the boards that score it, Muse Spark 1.3 is at 81.4 and GPT-6 Astra at 91.5 (out of 100).
Which is newer, Muse Spark 1.3 or GPT-6 Astra?
GPT-6 Astra. It went live on September 3, 2026, 1 day after Muse Spark 1.3 (September 2, 2026).
Which is cheaper, Muse Spark 1.3 or GPT-6 Astra?
Muse Spark 1.3 is cheaper on both input and output. On each vendor's own API, Muse Spark 1.3 is $1.25 input / $4.25 output per million tokens and GPT-6 Astra is $10 input / $50 output per million tokens. GPT-6 Astra's rate rises for prompts over 272K tokens. Prices as published in the models.dev catalog, as of 2026-09-27.
Which has the bigger context window, Muse Spark 1.3 or GPT-6 Astra?
GPT-6 Astra, at 1.05M tokens against Muse Spark 1.3's 1.05M, as each vendor lists it.
How do Muse Spark 1.3 and GPT-6 Astra compare for coding?
On the ArtificialWatch coding index, Muse Spark 1.3 is at 83.3 (#6 of 31) and GPT-6 Astra at 90 (#4). Muse Spark 1.3 scores higher on 1 of the 3 coding boards that rate both and GPT-6 Astra on 2.
Who makes Muse Spark 1.3 and GPT-6 Astra?
Muse Spark 1.3 is from Meta; GPT-6 Astra is from OpenAI.
Where do these numbers come from?
Each score is the leaderboard's own published figure, read by ArtificialWatch (table composed September 28, 2026). Boards measure different things, so raw scores are only comparable within a row.
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Also: the bench index · API pricing · the wire