$ diff claude-opus-5-5 muse-spark-1-3
Claude Opus 5.5 vs Muse Spark 1.3
Values come from Claude Opus 5.5 and Muse Spark 1.3, where each is cited to its source. This page states no benchmark result and ranks neither model — it puts two published specifications next to each other. Where a lab has not published a figure, the row says so rather than guessing.
AnthropicClaude Opus 5.5
- context
- 1M
- weights
- closed
- $/M in
- $4
- $/M out
- $20
- context
- 1M
- weights
- closed
- $/M in
- $1.25
- $/M out
- $4.25
What actually differs
- Context window
- Identical — both accept 1M tokens, so context length is not a reason to pick either.
- Input price
- Muse Spark 1.3 at $1.25/M against $4/M — 3.2× cheaper to feed. Standard rates: one of these labs also quotes a lower cached-input tier, which applies only when a prefix is reused — see the full spec below.
- Output price
- Muse Spark 1.3 at $4.25/M against $20/M — 4.7× cheaper to generate. Output dominates the bill on most agentic workloads, where the model writes far more than it reads.
- Recency
- Claude Opus 5.5 shipped 20 days after Muse Spark 1.3 (2026-09-22 vs 2026-09-02).
Full spec
| Attribute | Claude Opus 5.5 | Muse Spark 1.3 |
|---|---|---|
| Developer | Anthropic | Meta AI |
| Released | 2026-09-22 | 2026-09-02 |
| Context window | 1M tokens | 1,000,000 |
| Pricing | $4/M input · $20/M output · cache reads $0.20/M · cache writes $5/M | Standard $1.25/M input · $4.25/M output · Contributor ≈$0.10/M input · ≈$0.20/M output |
| License | proprietary (API-only; no weight release) | proprietary |
| Availability | Claude apps, Claude Code, Claude API as `claude-opus-5-5`, Amazon Bedrock, Google Cloud Vertex AI, Microsoft Foundry | Muse Code, Meta Model API |