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Muse Spark 1.3 vs Claude Opus 5
Of the 3 public leaderboards that rate both, Muse Spark 1.3 scores higher on 1 and Claude Opus 5 on 2. 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 59.9 and Claude Opus 5 at 73.9 (out of 100). On each maker's API, Muse Spark 1.3 costs $1.25 / $4.25 per 1M tokens (input / output) and Claude Opus 5 $5 / $25.
Scores as published by each board; table composed November 12, 2026.
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Leaderboard by leaderboard
| Board | Muse Spark 1.3 | Claude Opus 5 | Higher |
|---|---|---|---|
| LMArena Elo (community votes) | 1,655.1 | 1,691 | Claude Opus 5 |
| SimpleBench AVG@5 % (private set) | 81.8 | 80.6 | Muse Spark 1.3 |
| Epoch AI Epoch Capabilities Index (ECI) · many benchmarks on one scale | 158.2 | 164.7 | Claude Opus 5 |
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 76.2 (#10 of 47) and Claude Opus 5 at 85 (#7). Claude Opus 5 scores higher on both coding boards that rate them.
| Coding board | Muse Spark 1.3 | Claude Opus 5 |
|---|---|---|
| LMArena · Coding | 1,507.9 | 1,531.9 |
| Vals Vibe Code Bench | 85.9 | 88.4 |
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 · the open-weights Spark shipped Oct 15 as Muse Spark Open (its own entry).
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…
Claude Opus 5 at a glance
- Developer
- Anthropic
- Status
- Live since July 24, 2026
- API price
- $5 input / $25 output per 1M tokens · Anthropic, claude-opus-5
- Context window
- 1M tokens
Live — detected 16:51 UTC Jul 24, alert fired 61s later · superseded by Opus 5.5 on Sep 22 and moved to Anthropic's legacy list; still served at $5/$25, which is now MORE than its successor.
Claude Opus 5 is live — we detected it at 16:51 UTC and had alerts out 61 seconds later
2026-07-24 · Anthropic's Claude Opus 5 went live on the public API today. Our checkers saw the id appear at 16:51:33 UTC, confirmed it on the next 60-second sweep, and the alert blast went out at 16:52:34 — sixty-one seconds from first sighting to inbox.
Muse Spark 1.3 vs Claude Opus 5: quick answers
Which is better, Muse Spark 1.3 or Claude Opus 5?
It depends on what you measure. Of the 3 public leaderboards that rate both, Muse Spark 1.3 scores higher on 1 and Claude Opus 5 on 2. Muse Spark 1.3's widest lead is on SimpleBench; Claude Opus 5's widest lead is on Epoch AI. 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 59.9 and Claude Opus 5 at 73.9 (out of 100).
Which is newer, Muse Spark 1.3 or Claude Opus 5?
Muse Spark 1.3. It went live on September 2, 2026, 40 days after Claude Opus 5 (July 24, 2026).
Which is cheaper, Muse Spark 1.3 or Claude Opus 5?
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 Claude Opus 5 is $5 input / $25 output per million tokens. Prices as published in the models.dev catalog, as of 2026-11-12.
Which has the bigger context window, Muse Spark 1.3 or Claude Opus 5?
Muse Spark 1.3, at 1.05M tokens against Claude Opus 5's 1M, as each vendor lists it.
How do Muse Spark 1.3 and Claude Opus 5 compare for coding?
On the ArtificialWatch coding index, Muse Spark 1.3 is at 76.2 (#10 of 47) and Claude Opus 5 at 85 (#7). Claude Opus 5 scores higher on both coding boards that rate them.
Who makes Muse Spark 1.3 and Claude Opus 5?
Muse Spark 1.3 is from Meta; Claude Opus 5 is from Anthropic.
Where do these numbers come from?
Each score is the leaderboard's own published figure, read by ArtificialWatch (table composed November 12, 2026). Boards measure different things, so raw scores are only comparable within a row.
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Also: the bench index · API pricing · what a workload costs on each · the wire