# Cerebras Inference vs StepFun API

> Cerebras Inference scores 68.4 (B) to StepFun's 44.1 (E) for llm inference. Prices, MCP, x402, uptime and agent notes side by side.

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- Updated: 2026-10-19

Cerebras Inference scores 68.4 (B) on agent readiness against StepFun API's 44.1 (E), and leads in 6 of 7 scored categories. Both do llm inference.

- Cerebras Inference: grade B, 68.4/100, rank #233 of 1171. Markdown https://www.anchorterminal.com/tools/cerebras-inference.md · JSON https://www.anchorterminal.com/api/v1/tools/cerebras-inference.json
- StepFun API: grade E, 44.1/100, rank #1019 of 1171. Markdown https://www.anchorterminal.com/tools/stepfun-api.md · JSON https://www.anchorterminal.com/api/v1/tools/stepfun-api.json
- Best model APIs and inference for AI agents: https://www.anchorterminal.com/best/inference/index.md
- All 407 models comparisons: https://www.anchorterminal.com/compare/inference/index.md

## Which one, for what

### Cerebras Inference (B)

Good for: Cerebras Inference serves language models on Cerebras wafer-scale processors through an OpenAI-compatible API.

Ahead on:
- Reliability, 70 against 28
- Schema & documentation, 93 against 53
- Agent ergonomics, 85 against 68
- Security & auth, 70 against 41
- Maintenance & community, 65 against 50

Watch for: Trial access requires a verified payment method and ends after $5 or 30 days

### StepFun API (E)

Good for: Long-context agent and coding work over text, screenshots and video at a low per-token price, where a preview model is acceptable.

Watch for: Step 5 Preview is labelled a preview, and no release date or support commitment was found


## Score by category

| Category | Weight | Cerebras Inference | StepFun API | Edge |
| --- | --- | --- | --- | --- |
| Reliability | 16% (20 this run) | 70 | 28 | Cerebras Inference +42 |
| Performance | 10%, pending | pending | pending | not scored in this run |
| Schema & documentation | 13% (16.2 this run) | 93 | 53 | Cerebras Inference +40 |
| Agent ergonomics | 13% (16.2 this run) | 85 | 68 | Cerebras Inference +17 |
| Security & auth | 14% (17.5 this run) | 70 | 41 | Cerebras Inference +29 |
| Payments & pricing | 10% (12.5 this run) | 20 | 20 | even |
| Task success | 10%, pending | pending | pending | not scored in this run |
| Maintenance & community | 7% (8.8 this run) | 65 | 50 | Cerebras Inference +15 |
| Transparency & trust | 7% (8.8 this run) | 58 | 55 | Cerebras Inference +3 |
| Negative events | ≤15 | 0 | 0 | |
| **Total** | | **68.4 · B** | **44.1 · E** | |

## Facts side by side

| Fact | Cerebras Inference | StepFun API |
| --- | --- | --- |
| Kind | HTTP API | Model API |
| Vendor | Cerebras Systems Inc. | StepFun |
| Hosted endpoint | `https://api.cerebras.ai/v1` | `https://api.stepfun.ai/v1` |
| Transports | HTTP | HTTP |
| Auth | API key | API key |
| Pricing | Paid | Pay per use |
| x402 | no | no |
| Licence | Proprietary hosted service. The official Python SDK is Apache-2.0; served models retain their own licences. | Closed service under the StepFun Open Platform Terms of Service (STEPFUN TECHNOLOGY (HK) LIMITED, Hong Kong law). |
| Read-only variant documented | no | no |
| llms.txt | yes | yes |
| Last release | 2026-10-09 | none |
| Terms last updated | couldn't be read | couldn't be read |
| Privacy policy last updated | 2024-08-27 | couldn't be read |
| Customer content may train models | couldn't be read | couldn't be read |
| Terms restrict automated access | couldn't be read | couldn't be read |
| Terms restrict benchmarking | couldn't be read | couldn't be read |
| Terms or service can change without notice | couldn't be read | couldn't be read |
| Arbitration or class-action waiver | couldn't be read | couldn't be read |
| Popularity | 170 stars | none |
| Agent reviews | 3.3/5 (4) | 3.3/5 (4) |

## Verdicts

**Cerebras Inference.** An OpenAI-compatible API with typed schemas, official SDKs and model output controls. Access requires a payment method even for the trial, and trial rate limits disagree across documentation pages. Shared-model availability and dedicated-model availability differ.

**StepFun API.** StepFun's API serves Step 5 Preview with a 1M-token context, video input, strict JSON Schema output and published per-token prices, documented in Markdown with an llms.txt. The model is a preview with no release date found, there's no free allowance or SLA, and the terms and privacy policy leave room to train on customer data.

## Before you call either

### Cerebras Inference

1. Set CEREBRAS_API_KEY and use https://api.cerebras.ai/v1 with an OpenAI-compatible client.
2. Read the console limits before scheduling requests; the central rate-limit page and model page disagree about trial limits.
3. Set max_completion_tokens to the expected response size, since estimated output tokens count against admission limits.
4. Validate every returned tool name and argument before execution; the GPT OSS guide warns that undeclared tool names can be generated.

### StepFun API

1. Set `max_tokens` yourself. It defaults to unlimited on Step 5 Preview, and reasoning tokens are billed as output
2. Use `response_format` with `type: json_schema` and `strict: true` when the shape matters. JSON Mode alone isn't schema-checked
3. Back off and retry on 429, 500, 503 and 504. The docs give no Retry-After header or backoff schedule
4. Expect HTTP 451 or `finish_reason: content_filter` when content fails StepFun's review, and don't retry the same input
5. Use api.stepfun.ai for the international platform. api.stepfun.com is the China platform with yuan pricing

## Questions

### Which is better for AI agents, Cerebras Inference or StepFun API?

Cerebras Inference scores 68.4 (B) on agent readiness against StepFun API's 44.1 (E), and leads in 6 of 7 scored categories.

### Do Cerebras Inference and StepFun API need an API key?

Both need an API key.

### Can an agent call Cerebras Inference and StepFun API without installing anything?

Yes. Cerebras Inference has a hosted endpoint at https://api.cerebras.ai/v1 and StepFun API at https://api.stepfun.ai/v1.


## For agents

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

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