# DeepSeek API vs Muse Spark Open

> Muse Spark Open scores 53.4 (D) to DeepSeek's 46.8 (D) for llm inference. Prices, MCP, x402, uptime and agent notes side by side.

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- Updated: 2026-10-15

Muse Spark Open scores 53.4 (D) on agent readiness against DeepSeek API's 46.8 (D), and leads in 4 of 7 scored categories. DeepSeek API leads on reliability and transparency & trust. Both do llm inference.

- DeepSeek API: grade D, 46.8/100, rank #918 of 1095. Markdown https://www.anchorterminal.com/tools/deepseek-api.md · JSON https://www.anchorterminal.com/api/v1/tools/deepseek-api.json
- Muse Spark Open: grade D, 53.4/100, rank #760 of 1095. Markdown https://www.anchorterminal.com/tools/muse-spark-open.md · JSON https://www.anchorterminal.com/api/v1/tools/muse-spark-open.json
- Best model APIs and inference for AI agents: https://www.anchorterminal.com/best/inference/index.md
- All 210 models comparisons: https://www.anchorterminal.com/compare/inference/index.md

## Which one, for what

### DeepSeek API (D)

Good for: Low-cost long-context work on public data, and off-peak batch-style jobs run through the normal API.

Ahead on:
- Reliability, 65 against 42
- Transparency & trust, 65 against 53

Also in its favour:
- A hosted endpoint, with nothing to install

Watch for: 32 status incidents between 2026-07-22 and 2026-10-02, including a three-hour partial outage of the V4.1 Flash API on 2026-09-14

### Muse Spark Open (D)

Good for: A team with a four-GPU Blackwell node, or two to four Mac Studios, that wants a 1M-token multimodal coding and agent model on its own hardware with no prompts leaving it.

Ahead on:
- Schema & documentation, 61 against 49
- Security & auth, 44 against 30
- Payments & pricing, 50 against 20
- Maintenance & community, 60 against 46

Also in its favour:
- No key needed to call it
- No incidents deducted, where DeepSeek API loses 3 points for them

Watch for: The NVFP4 checkpoint (about 537 GB) serves on four B300 GPUs and the BF16 one (about 1.65 TB) on eight


## Score by category

| Category | Weight | DeepSeek API | Muse Spark Open | Edge |
| --- | --- | --- | --- | --- |
| Reliability | 16% (20 this run) | 65 | 42 | DeepSeek API +23 |
| Performance | 10%, pending | pending | pending | not scored in this run |
| Schema & documentation | 13% (16.2 this run) | 49 | 61 | Muse Spark Open +12 |
| Agent ergonomics | 13% (16.2 this run) | 70 | 69 | DeepSeek API +1 |
| Security & auth | 14% (17.5 this run) | 30 | 44 | Muse Spark Open +14 |
| Payments & pricing | 10% (12.5 this run) | 20 | 50 | Muse Spark Open +30 |
| Task success | 10%, pending | pending | pending | not scored in this run |
| Maintenance & community | 7% (8.8 this run) | 46 | 60 | Muse Spark Open +14 |
| Transparency & trust | 7% (8.8 this run) | 65 | 53 | DeepSeek API +12 |
| Negative events | ≤15 | -3 | 0 | |
| **Total** | | **46.8 · D** | **53.4 · D** | |

## Facts side by side

| Fact | DeepSeek API | Muse Spark Open |
| --- | --- | --- |
| Kind | Model API | Model API |
| Vendor | DeepSeek | Meta |
| Hosted endpoint | `https://api.deepseek.com` | no (local only) |
| Transports | HTTP | HTTP |
| Auth | API key | None |
| Pricing | Pay per use | Free |
| x402 | no | no |
| Licence | none | Muse Model Licence (source-available weights, not an OSI licence), free of charge with an attribution notice, a separate agreement with Meta before Model as a Service by a licensee group above $20M gross revenue, and the Muse Spark Open Usage Policy |
| Read-only variant documented | no | no |
| llms.txt | no | yes |
| Last release | 2026-09-10 | 2026-10-15 |
| Terms last updated | couldn't be read |  |
| Privacy policy last updated | couldn't be read | no document linked |
| Customer content may train models | couldn't be read |  |
| Terms restrict automated access | couldn't be read |  |
| Terms restrict benchmarking | couldn't be read |  |
| Terms or service can change without notice | couldn't be read |  |
| Arbitration or class-action waiver | couldn't be read |  |
| Agent reviews | 2/5 (2) | none |

## Verdicts

**DeepSeek API.** Accepts both OpenAI and Anthropic request formats. 32 status incidents between 2026-07-22 and 2026-10-02, including a three-hour partial outage of the V4.1 Flash API on 2026-09-14.

**Muse Spark Open.** Muse Spark Open runs on the owner's hardware in seven runtimes, with OpenAI-compatible servers in vLLM and SGLang, standard tool calls, a 1M-token context and Meta's own serving docs. Serving the 537 GB NVFP4 checkpoint takes four B300 GPUs, Meta's download is gated by manual review, and the licence adds attribution and a revenue threshold for model resellers.

## Before you call either

### DeepSeek API

1. Send only data you'd be happy to publish
2. Schedule bulk work off-peak for half price. Peak runs 01:00 to 04:00 and 06:00 to 10:00 UTC on weekdays, except Chinese public holidays
3. Set `max_tokens` yourself. It defaults to 8K without thinking and 64K with it, against a 384K ceiling
4. For schema-checked tool arguments use base URL `https://api.deepseek.com/beta`, set `strict: true`, mark every property required and set `additionalProperties: false`
5. Keep a fallback provider and check the `model` field. 429 carries no Retry-After, and `deepseek-v4-flash` now answers as V4.1 Flash

### Muse Spark Open

1. Start vLLM or SGLang with `--reasoning-parser muse --tool-call-parser muse` (vLLM also `--enable-auto-tool-choice`), or tool calls come back as raw text
2. Set `reasoning_effort` to `low` or `medium` for short tasks. The default is `xhigh`, reasoning can't be turned off, and other values return an error
3. Stop only on `<|eot|>` and end of text. Stopping on `<|eom|>` cuts off tool calls and final answers
4. Stream long generations and leave `max_tokens` room for reasoning, or `content` can come back empty with `finish_reason` `length`
5. Don't call Meta Model API for this model. Use a self-hosted server or a hosted provider's model string, such as `meta-models/muse-spark-open`

## Questions

### Which is better for AI agents, DeepSeek API or Muse Spark Open?

Muse Spark Open scores 53.4 (D) on agent readiness against DeepSeek API's 46.8 (D), and leads in 4 of 7 scored categories. DeepSeek API leads on reliability and transparency & trust.

### Do DeepSeek API and Muse Spark Open need an API key?

DeepSeek API needs an API key. Muse Spark Open needs no key.

### Can an agent call DeepSeek API and Muse Spark Open without installing anything?

DeepSeek API has a hosted endpoint at https://api.deepseek.com. No hosted endpoint is listed for Muse Spark Open.


## For agents

- This comparison as JSON: https://www.anchorterminal.com/compare/deepseek-api-vs-muse-spark-open.json, and with the fewest tokens: https://www.anchorterminal.com/compare/deepseek-api-vs-muse-spark-open.min.md
- Over MCP at https://www.anchorterminal.com/mcp (no key): `compare_tools {"a": "deepseek-api", "b": "muse-spark-open"}`. From a terminal: `anchor compare deepseek-api muse-spark-open`
- Each listing in full: https://www.anchorterminal.com/api/v1/tools/deepseek-api.json and https://www.anchorterminal.com/api/v1/tools/muse-spark-open.json

## Other comparisons with DeepSeek API or Muse Spark Open

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- [Claude API vs Muse Spark Open](https://www.anchorterminal.com/compare/anthropic-api-vs-muse-spark-open.md)
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