All tasks / Comparisons

GPT-6.1 Sol vs Muse Spark 1.3

Compared only on public benchmark results, across the 5 tasks where both are listed: GPT-6.1 Sol is a tier higher in 1 of 5 shared tasks, Muse Spark 1.3 in 1, they share a tier in 3.

GPT-6.1 Sol

OpenAI's mid-priced GPT tier, described as near-Astra performance for complex work at lower cost.

Vendor: OpenAI
Weights: Closed: API and apps only
Released: 29 Sep 2026
API price: $2 in / $10 out per 1M tokens
License: proprietary
Last verified: 18 Oct 2026

Alternatives to GPT-6.1 Sol

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-6.1 Sol	Muse Spark 1.3	Higher tier
Chat & assistants Models	S1,484 on LMArena Text Arena (overall, style control) · Cloud	S1,494 on LMArena Text Arena (overall, style control) · Cloud	Same tier
Writing Models	A1,458 on LMArena Text Arena: Creative Writing (style control) · Cloud	A1,461 on LMArena Text Arena: Creative Writing (style control) · Cloud	Same tier
Coding Models	A1,754 on LMArena WebDev / Code Arena (overall) · Cloud	B1,659 on LMArena WebDev / Code Arena (overall) · Cloud	GPT-6.1 Sol
Image understanding Models	S1,294 on LMArena Vision Arena (overall, style control) · Cloud	S1,290 on LMArena Vision Arena (overall, style control) · Cloud	Same tier
Browser & computer agents Models	–No public result yet · Cloud	A39.3% on OSWorld 2.0 (end-to-end models) · Cloud	Muse Spark 1.3

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-6.1 Sol	Muse Spark 1.3	Snapshot
Artificial Analysis Intelligence Index Composite index over Artificial Analysis' own evaluation suite, higher is better	52 GPT-6.1 Sol (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% GPT-6.1 Sol (Max)	82% Muse Spark 1.3 (Xhigh)	19 Oct 2026
LMArena Text Arena (overall, style control) Arena score (Bradley-Terry rating from pairwise human votes, style-controlled default view), higher is better	1,484 gpt-6.1-sol-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	1,458 gpt-6.1-sol-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	1,294 gpt-6.1-sol-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	1,754 GPT-6.1 Sol (Max)	1,659 Muse Spark 1.3 (Max)	18 Oct 2026