Claude Opus 4.8 vs Muse Spark 1.3 — Price, Context, and Capability Compared
Claude Opus 4.8 vs Muse Spark 1.3: which should I use?
Claude Opus 4.8 costs 5.0× more per blended million tokens than Muse Spark 1.3. Muse Spark 1.3 has the larger context window (1,048,576 tokens). Default to Muse Spark 1.3 unless you specifically need Claude Opus 4.8's edge.
Where can you find price, speed, and task evidence for Claude Opus 4.8 and Muse Spark 1.3?
Which tasks fit Claude Opus 4.8 and Muse Spark 1.3?
Best-fit task signals from the published model strengths; this is not a substitute for a controlled benchmark.
| Fact | Claude Opus 4.8 | Muse Spark 1.3 |
|---|---|---|
| Best fit | Complex, multi-step tasks where Fable 5’s premium isn’t justified. | Long-horizon coding agents and multi-step tool-use workflows on Meta’s first-party API. |
| Reasoning mode | Available | Available |
What does a Coding Agent workload cost with Claude Opus 4.8 and Muse Spark 1.3?
Modeled for Coding Agent: 20,000 input + 2,000 output tokens per task, 1 turn. This is a workload model, not a provider quote.
| Fact | Claude Opus 4.8 | Muse Spark 1.3 |
|---|---|---|
| Coding Agent / task | $0.15 (modeled) | $0.03 (modeled) (winner) |
| Input / output rate | $5.00 / $25.00 per M | $1.25 / $4.25 per M |
How fast are Claude Opus 4.8 and Muse Spark 1.3?
Only non-estimated benchmark results are shown as measured.
| Fact | Claude Opus 4.8 | Muse Spark 1.3 |
|---|---|---|
| Measured throughput | 58 tokens/s | Unavailable |
| Time to first token | 470 ms | Unavailable |
How compatible are Claude Opus 4.8 and Muse Spark 1.3 with APIs?
Provider-level wire-format and SDK facts; model-specific parameter differences may still apply.
| Fact | Claude Opus 4.8 | Muse Spark 1.3 |
|---|---|---|
| OpenAI SDK | Not drop-in | Usable |
| Request shape | Messages API — system prompt is a top-level field, not a message role, and max_tokens is required on every call. | OpenAI-compatible chat/completions endpoint at api.meta.ai/v1; select the Contributor tier with the muse-spark-1.3-contributor model id. |
| Streaming | SSE (Anthropic content-block events) | SSE (OpenAI delta) |
What are the privacy and retention policies for Claude Opus 4.8 and Muse Spark 1.3?
Provider policy and residency facts from the verified provider registry. A missing retention policy is not treated as a guarantee.
| Fact | Claude Opus 4.8 | Muse Spark 1.3 |
|---|---|---|
| Provider says API data trains models | No | Unavailable |
| Published retention period | Unavailable | Unavailable |
| Data residency | Unavailable | Unavailable |
How much effort does it take to migrate between Claude Opus 4.8 and Muse Spark 1.3?
Direction is from each displayed model to the other. Effort is derived from provider compatibility and published parameter maps.
| Fact | Claude Opus 4.8 | Muse Spark 1.3 |
|---|---|---|
| Move Claude Opus 4.8 → Muse Spark 1.3 | config; 3 breaking parameter differences | Target: Muse Spark 1.3 |
| Move Muse Spark 1.3 → Claude Opus 4.8 | Source: Muse Spark 1.3 | code-change; 5 breaking parameter differences |
| Why | Keep the `openai` SDK; change `baseURL` and the API key. | Messages API — system prompt is a top-level field, not a message role, and max_tokens is required on every call. |
How do Claude Opus 4.8 and Muse Spark 1.3 compare on specs?
| Claude Opus 4.8 | Muse Spark 1.3 | |
|---|---|---|
| Price (input) | $5.00/M | $1.25/M ✓ |
| Price (output) | $25.00/M | $4.25/M ✓ |
| Blended price | $10.00/M | $2.00/M ✓ |
| Context window | 500,000 tokens | 1,048,576 tokens ✓ |
| Max output | 64,000 tokens | 128,000 tokens ✓ |
| Modalities | text, vision | text |
| Reasoning mode | Yes | Yes |
| Released | 2026-04 | 2026-09 |
| Speed | 58 t/s | Not measured |
How much do Claude Opus 4.8 and Muse Spark 1.3 cost at scale?
| Tokens / month | Claude Opus 4.8 | Muse Spark 1.3 | Delta |
|---|---|---|---|
| 1,000,000 | $10.00 | $2.00 | $8.00 (5.0×) |
| 10,000,000 | $100.00 | $20.00 | $80.00 (5.0×) |
| 100,000,000 | $1000.00 | $200.00 | $800.00 (5.0×) |
Choose Claude Opus 4.8 if…
- ✓Elite coding and multi-step reasoning
- ✓Strong instruction following on ambiguous prompts
- ✓Extended-thinking mode
- ✓Complex, multi-step tasks where Fable 5’s premium isn’t justified.
Choose Muse Spark 1.3 if…
- ✓Built for long-horizon coding and multi-step agentic work
- ✓Improved tool, browser, and computer use across harnesses
- ✓Native tool calling and MCP support
- ✓Long-horizon coding agents and multi-step tool-use workflows on Meta’s first-party API.
Run this exact matchup right now
Send the same prompt to Claude Opus 4.8 and Muse Spark 1.3 side by side and see the outputs yourself.
Try Claude Opus 4.8 vs Muse Spark 1.3 FreeWhat are common questions about Claude Opus 4.8 and Muse Spark 1.3?
Is Claude Opus 4.8 cheaper than Muse Spark 1.3?
Muse Spark 1.3 is cheaper, at $2.00 per million blended tokens vs $10.00 for Claude Opus 4.8.
Which has the bigger context window, Claude Opus 4.8 or Muse Spark 1.3?
Muse Spark 1.3 has the larger context window: 1,048,576 tokens vs 500,000.
Can Claude Opus 4.8 replace Muse Spark 1.3 for coding?
Both are viable for coding. Elite coding and multi-step reasoning (Claude Opus 4.8) vs Built for long-horizon coding and multi-step agentic work (Muse Spark 1.3) — pick based on which strength matters more for your workload.
Neither of these? See Claude Opus 4.8 alternatives.
What related comparisons help choose between Claude Opus 4.8 and Muse Spark 1.3?
Pricing verified 2026-06-07. Specs verified 2026-08-14.