All tasks / Comparisons

GPT-6 Astra vs Muse Spark 1.3

Compared only on public benchmark results, across the 7 tasks where both are listed: GPT-6 Astra is a tier higher in 2 of 7 shared tasks, Muse Spark 1.3 in 2, they share a tier in 3.

GPT-6 Astra

OpenAI's most capable GPT tier, introduced with GPT-6, aimed at complex reasoning and coding.

Vendor: OpenAI
Weights: Closed: API and apps only
Released: 3 Sep 2026
API price: $10 in / $50 out per 1M tokens
License: proprietary
Last verified: 18 Oct 2026

Alternatives to GPT-6 Astra

Muse Spark 1.3

Meta's mid-tier proprietary Muse model line, offered through Meta's API.

Vendor: Meta
Weights: Closed: API and apps only
Released: Sep 2026
API price: $1.25 in / $4.25 out per 1M tokens
License: proprietary
Last verified: 18 Oct 2026

Alternatives to Muse Spark 1.3

Task by task

Task	GPT-6 Astra	Muse Spark 1.3	Higher tier
Chat & assistants Models	A1,477 on LMArena Text Arena (overall, style control) · Cloud	S1,494 on LMArena Text Arena (overall, style control) · Cloud	Muse Spark 1.3
Writing Models	A1,450 on LMArena Text Arena: Creative Writing (style control) · Cloud	A1,461 on LMArena Text Arena: Creative Writing (style control) · Cloud	Same tier
Coding Models	S1,776 on LMArena WebDev / Code Arena (overall) · Cloud	B1,659 on LMArena WebDev / Code Arena (overall) · Cloud	GPT-6 Astra
Image understanding Models	S1,286 on LMArena Vision Arena (overall, style control) · Cloud	S1,290 on LMArena Vision Arena (overall, style control) · Cloud	Same tier
Vector graphics & logos Models	B1,431 on Design Arena SVG · Cloud	C1,323 on Design Arena SVG · Cloud	GPT-6 Astra
Browser & computer agents Models	–No public result yet · Cloud	A39.3% on OSWorld 2.0 (end-to-end models) · Cloud	Muse Spark 1.3
Slides & presentations Models	A1,246 on Design Arena Python-PPTX Slides · Cloud	A1,244 on Design Arena Python-PPTX Slides · Cloud	Same tier

A tier spans a range of scores, and small gaps on a leaderboard are often within its margin of error, so only a different tier counts as ahead. How we rank.

Same benchmark, both results

Benchmark	GPT-6 Astra	Muse Spark 1.3	Snapshot
Artificial Analysis Intelligence Index Composite index over Artificial Analysis' own evaluation suite, higher is better	53 GPT-6 Astra (Max)	48 Muse Spark 1.3 (Max)	18 Oct 2026
Artificial Analysis MMMU-Pro (independent evaluation) Accuracy on MMMU-Pro (multi-discipline multimodal questions over images), as run by Artificial Analysis, higher is better	86.9% GPT-6 Astra (Max)	82% Muse Spark 1.3 (Xhigh)	19 Oct 2026
Design Arena Python-PPTX Slides Elo rating from crowdsourced blind pairwise votes on PowerPoint decks that models build with python-pptx in Design Arena's agent harness, higher is better	1,246 GPT-6 Astra (xhigh)	1,244 Muse Spark 1.3 (xhigh)	18 Oct 2026
Design Arena SVG Elo rating from crowdsourced blind pairwise votes on SVG markup that models generate from a prompt (icons, illustrations, diagrams, artistic compositions), higher is better	1,431 GPT-6 Astra (xhigh)	1,323 Muse Spark 1.3 Max	19 Oct 2026
EQ-Bench Creative Writing v3 Elo score from LLM-judged pairwise comparisons of creative-writing outputs (rubric score shown alongside), higher is better	2,173 gpt-6-astra	1,906 muse-spark-1.3	24 Sep 2026
LMArena Text Arena (overall, style control) Arena score (Bradley-Terry rating from pairwise human votes, style-controlled default view), higher is better	1,477 gpt-6-astra-max	1,494 Muse Spark 1.3 (Max)	15 Oct 2026
LMArena Text Arena: Creative Writing (style control) Arena score (Bradley-Terry rating from pairwise human votes, creative-writing prompts only, style-controlled view), higher is better	1,450 gpt-6-astra-max	1,461 Muse Spark 1.3 (Max)	15 Oct 2026
LMArena Vision Arena (overall, style control) Arena score (Bradley-Terry rating from pairwise human votes on image + text prompts, style-controlled view), higher is better	1,286 gpt-6-astra-max	1,290 muse-spark-1.3-max	9 Oct 2026
LMArena WebDev / Code Arena (overall) Arena score (Bradley-Terry rating from pairwise human votes on web-app generation), higher is better	1,776 GPT-6 Astra (Max)	1,659 Muse Spark 1.3 (Max)	18 Oct 2026