Claude Sonnet 4.5 vs Muse Spark 1.2
At a Glance
| Compare | Claude Sonnet 4.5Anthropic |  Muse Spark 1.2Meta |
|---|---|---|
| Intelligence, Cost, and Efficiency | ||
| IntelligenceHigher is better · MM Intelligence v2.5 | #36 of 4627.7 score · 2/3 sources · provisional · missing LiveBench · full-core range 18.5–51.8 | UnrankedNot in the 46-model eligible cohort |
| Pricing and Limits | ||
| Input priceFrom · USD / 1M tokens | $3.00Anthropic ↗ · Sep 3, 2026 | Not reported |
| Output priceFrom · USD / 1M tokens | $15.00Anthropic ↗ · Sep 3, 2026 | Not reported |
| Context windowMaximum documented tokens | 200K | Not reported |
| 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 | Claude Sonnet 4.5 | Muse Spark 1.2 |
|---|---|---|
| LMArena Text Arenatext-2026-09-13-d25aabda0010 · arena_rating · leader | 1,433.9496% of row best · rating · claude-sonnet-4-5-20250929-high-32k; 95% CI [1431.13982742, 1436.74901697]; votes 80980; rank 81 | 1,489.44100% of row best · rating · muse-spark-1.2 (xHigh); 95% CI [1478.95697715, 1499.92080617]; votes 3227; rank 11 |
| Overall ResultCounted from the protocol-matched rows above | 0 benchmark winsNo overall winner | 1 benchmark winNo overall winner |
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 | Claude Sonnet 4.5 | Muse Spark 1.2 |
|---|---|---|
| Developer | Anthropic | Meta |
| Family | Claude 4 | Muse Spark |
| Model | Claude Sonnet 4.5 | Muse Spark 1.2 |
| Version | Claude Sonnet 4.5 | Muse Spark 1.2 |
| Lifecycle | active | preview |
| Released | 2025-09-29 | 2026-08-05 |
| Knowledge cutoff | 2025-01-01 | Unknown |
| Input modalities | Text, Image | Text, Image, Video, Audio |
| Output modalities | Text | Text |
| Context window | 200K | Unknown |
| 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 | Anthropic (Standard) | Unknown |
| Capabilities | chat, generation, reasoning, structured_outputs, tools | chat, computer-use, generation, reasoning, research, structured_outputs, tools |
Claude Sonnet 4.5 Capabilities
Muse Spark 1.2 Capabilities
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Primary Evidence
Sources and Freshness
Questions
Claude Sonnet 4.5 vs Muse Spark 1.2 FAQs
Is Claude Sonnet 4.5 or Muse Spark 1.2 better for coding?+
This comparison does not currently contain a protocol-matched coding benchmark for both Claude Sonnet 4.5 and Muse Spark 1.2, so Model Markets cannot name a coding leader from pricing, context size, or capability labels alone.
Which is cheaper, Claude Sonnet 4.5 or Muse Spark 1.2?+
Only Claude Sonnet 4.5 has a directly sourced input price: $3.00 per million tokens. Only Claude Sonnet 4.5 has a directly sourced output price: $15.00 per million tokens.
Which has a larger context window, Claude Sonnet 4.5 or Muse Spark 1.2?+
Neither model has a larger sourced context window in this comparison. Claude Sonnet 4.5 is 200K and Muse Spark 1.2 is —.
Which performs better in benchmarks, Claude Sonnet 4.5 or Muse Spark 1.2?+
There is no overall benchmark winner: At least two independently verified, protocol-matched benchmarks are required for an overall winner.
Can Claude Sonnet 4.5 or Muse Spark 1.2 be self-hosted?+
Both models have the same recorded self-hosting status: unsupported. Claude Sonnet 4.5 is not marked open weight; Muse Spark 1.2 is not marked open weight.
Can Claude Sonnet 4.5 and Muse Spark 1.2 understand images?+
Claude Sonnet 4.5 is documented with image input; Muse Spark 1.2 is documented with image input. This reflects supported input modalities, not vision quality.
Which can generate longer answers, Claude Sonnet 4.5 or Muse Spark 1.2?+
Neither has a larger sourced maximum output. Claude Sonnet 4.5 is 64K and Muse Spark 1.2 is —.
Do Claude Sonnet 4.5 and Muse Spark 1.2 support reasoning and tool use?+
Claude Sonnet 4.5: reasoning, tool calling, and image input. Muse Spark 1.2: reasoning, tool calling, and image input. Feature support does not establish relative quality.
Which is available from more inference providers, Claude Sonnet 4.5 or Muse Spark 1.2?+
Claude Sonnet 4.5 has 1 sourced provider route; Muse Spark 1.2 has 0, so Claude Sonnet 4.5 has broader tracked availability.
Which offers better value, Claude Sonnet 4.5 or Muse Spark 1.2?+
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.