Muse Spark 1.2 vs GPT-5.5
At a Glance
| Compare |  Muse Spark 1.2Meta |  GPT-5.5OpenAI |
|---|---|---|
| Intelligence, Cost, and Efficiency | ||
| IntelligenceHigher is better · MM Intelligence v2.5 | UnrankedNot in the 46-model eligible cohort | #7 of 4683.9 score · 3/3 sources · complete |
| CostLower is better · Published-token output estimate | UnrankedNot in the 44-model eligible cohort | #38 of 44$0.341 per LiveBench case |
| EfficiencyHigher is better · MM Efficiency v1.5 | UnrankedNot in the 38-model eligible cohort | #18 of 3853.4 score · 3/3 sources · complete |
| Pricing and Limits | ||
| Input priceFrom · USD / 1M tokens | Not reported | $5.00Openai ↗ · Sep 3, 2026 |
| Output priceFrom · USD / 1M tokens | Not reported | $30.00Openai ↗ · Sep 3, 2026 |
| Context windowMaximum documented tokens | Not reported | 1,050K |
| Model facts checked | Sep 3, 2026View model evidence → | Sep 3, 2026View model evidence → |
Token prices are the lowest available sourced USD rates; input and output may use different providers. Cost ranking estimates output spend on LiveBench, not a full request bill. Ranking methodology →
Available Benchmarks
| Benchmark | Muse Spark 1.2 | GPT-5.5 |
|---|---|---|
| LMArena Agent Arenaagent-2026-09-15-d25aabda0010 · outcome_score · leader | -1.7796% of row best · score · Muse Spark 1.2 (xHigh); 95% CI [-2.69255217, -0.84918781]; sessions 33094; observations 1437075; rank 32 | 2.67100% of row best · score · GPT 5.5; 95% CI [1.85777151, 3.48040109]; sessions 81254; observations 2107641; rank 20 |
| LMArena Text Arenatext-2026-09-13-d25aabda0010 · arena_rating · leader | 1,489.44100% of row best · rating · muse-spark-1.2 (xHigh); 95% CI [1478.95697715, 1499.92080617]; votes 3227; rank 11 | 1,465.5998% of row best · rating · gpt-5.5; 95% CI [1461.82849712, 1469.35015015]; votes 66317; rank 31 |
| LMArena Vision Arenavision-2026-09-13-d25aabda0010 · arena_rating · statistical tie | 1,303.88100% of row best · rating · muse-spark-1.2 (xHigh); 95% CI [1289.13624882, 1318.62565115]; votes 1841; rank 14 | 1,294.1999% of row best · rating · gpt-5.5-high; 95% CI [1287.85384790, 1300.52893287]; votes 21960; rank 20 |
| LiveBench2026-06-25 · overall · leader | 81.8897% of row best · percent · muse-spark-1.2-xhigh · 18,700 output tokens / case | 84.54100% of row best · percent · gpt-5.5-xhigh · 11,355 output tokens / case |
| Overall ResultCounted from the protocol-matched rows above · 1 tie | 1 benchmark win | 2 benchmark winsOverall lead |
Third-party benchmark Only like-for-like primary-publisher results are shown; raw scores, relative scores, configuration, and token spend remain visible.
Side-by-Side Facts
| Field | Muse Spark 1.2 | GPT-5.5 |
|---|---|---|
| Developer | Meta | OpenAI |
| Family | Muse Spark | Gpt 5 5 |
| Model | Muse Spark 1.2 | GPT-5.5 |
| Version | Muse Spark 1.2 | GPT-5.5 |
| Lifecycle | preview | active |
| Released | 2026-08-05 | 2026-04-23 |
| Knowledge cutoff | Unknown | 2025-12-01 |
| Input modalities | Text, Image, Video, Audio | Text, Image |
| Output modalities | Text | Text |
| Context window | Unknown | 1,050K |
| Total parameters | Unknown | Unknown |
| Active parameters | Unknown | Unknown |
| License | Unknown | Unknown |
| Open weights | No | No |
| API available | Yes | Yes |
| Self-hostable | No | No |
| Provider access | Unknown | Openai (Standard), Openrouter (Standard) |
| Capabilities | chat, computer-use, generation, reasoning, research, structured_outputs, tools | chat, generation, reasoning, structured_outputs, tools |
Muse Spark 1.2 Capabilities
GPT-5.5 Capabilities
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Primary Evidence
Sources and Freshness
Questions
Muse Spark 1.2 vs GPT-5.5 FAQs
Is Muse Spark 1.2 or GPT-5.5 better for coding?+
This comparison does not currently contain a protocol-matched coding benchmark for both Muse Spark 1.2 and GPT-5.5, so Model Markets cannot name a coding leader from pricing, context size, or capability labels alone.
Which is cheaper, Muse Spark 1.2 or GPT-5.5?+
Only GPT-5.5 has a directly sourced input price: $5.00 per million tokens. Only GPT-5.5 has a directly sourced output price: $30.00 per million tokens.
Which has a larger context window, Muse Spark 1.2 or GPT-5.5?+
Neither model has a larger sourced context window in this comparison. Muse Spark 1.2 is — and GPT-5.5 is 1,050K.
Which performs better in benchmarks, Muse Spark 1.2 or GPT-5.5?+
GPT-5.5 leads the current overall benchmark count. The result uses 4 protocol-matched benchmarks from 2 publishers; it is not a universal quality score.
Can Muse Spark 1.2 or GPT-5.5 be self-hosted?+
Both models have the same recorded self-hosting status: unsupported. Muse Spark 1.2 is not marked open weight; GPT-5.5 is not marked open weight.
Can Muse Spark 1.2 and GPT-5.5 understand images?+
Muse Spark 1.2 is documented with image input; GPT-5.5 is documented with image input. This reflects supported input modalities, not vision quality.
Which can generate longer answers, Muse Spark 1.2 or GPT-5.5?+
Neither has a larger sourced maximum output. Muse Spark 1.2 is — and GPT-5.5 is 128K.
Do Muse Spark 1.2 and GPT-5.5 support reasoning and tool use?+
Muse Spark 1.2: reasoning, tool calling, and image input. GPT-5.5: reasoning, tool calling, and image input. Feature support does not establish relative quality.
Which is available from more inference providers, Muse Spark 1.2 or GPT-5.5?+
Muse Spark 1.2 has 0 sourced provider routes; GPT-5.5 has 2, so GPT-5.5 has broader tracked availability.
Which offers better value, Muse Spark 1.2 or GPT-5.5?+
There is no universal value winner. Compare the input and output prices above with the matched benchmark result for your workload: cheaper tokens can be offset by different quality, token usage, latency, or provider availability.