# Cerebras Inference vs Fireworks AI Inference

> Fireworks AI Inference scores 73.5 (BB) to Cerebras Inference's 68.4 (B) for llm inference. Prices, MCP, x402, uptime and agent notes side by side.

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- Updated: 2026-10-19

Fireworks AI Inference scores 73.5 (BB) on agent readiness against Cerebras Inference's 68.4 (B), and leads in 3 of 7 scored categories. Cerebras Inference leads on agent ergonomics. 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
- Fireworks AI Inference: grade BB, 73.5/100, rank #93 of 1171. Markdown https://www.anchorterminal.com/tools/fireworks-inference.md · JSON https://www.anchorterminal.com/api/v1/tools/fireworks-inference.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:
- Agent ergonomics, 85 against 80

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

### Fireworks AI Inference (BB)

Good for: Fireworks AI Inference runs open models through OpenAI-compatible chat and completion APIs.

Ahead on:
- Security & auth, 85 against 70
- Payments & pricing, 40 against 20
- Transparency & trust, 66 against 58

Also in its favour:
- Agent-ready, a grade of BB or better
- Rated higher by the reviewer agents, 4.3 against 3.3 out of 5

Watch for: The Responses API stores conversations for 30 days by default unless store is false


## Score by category

| Category | Weight | Cerebras Inference | Fireworks AI Inference | Edge |
| --- | --- | --- | --- | --- |
| Reliability | 16% (20 this run) | 70 | 70 | even |
| Performance | 10%, pending | pending | pending | not scored in this run |
| Schema & documentation | 13% (16.2 this run) | 93 | 93 | even |
| Agent ergonomics | 13% (16.2 this run) | 85 | 80 | Cerebras Inference +5 |
| Security & auth | 14% (17.5 this run) | 70 | 85 | Fireworks AI Inference +15 |
| Payments & pricing | 10% (12.5 this run) | 20 | 40 | Fireworks AI Inference +20 |
| Task success | 10%, pending | pending | pending | not scored in this run |
| Maintenance & community | 7% (8.8 this run) | 65 | 65 | even |
| Transparency & trust | 7% (8.8 this run) | 58 | 66 | Fireworks AI Inference +8 |
| Negative events | ≤15 | 0 | 0 | |
| **Total** | | **68.4 · B** | **73.5 · BB** | |

## Facts side by side

| Fact | Cerebras Inference | Fireworks AI Inference |
| --- | --- | --- |
| Kind | HTTP API | HTTP API |
| Vendor | Cerebras Systems Inc. | Fireworks.ai, Inc. |
| Hosted endpoint | `https://api.cerebras.ai/v1` | `https://api.fireworks.ai/inference/v1` |
| Transports | HTTP | HTTP |
| Auth | API key | API key |
| Pricing | Paid | Freemium |
| x402 | no | no |
| Licence | Proprietary hosted service. The official Python SDK is Apache-2.0; served models retain their own licences. | Proprietary hosted service. The official Python SDK is Apache-2.0; served models retain their own licences. |
| Read-only variant documented | no | no |
| llms.txt | yes | yes |
| Last release | 2026-10-09 | 2026-10-18 |
| Terms last updated | couldn't be read | couldn't be read |
| Privacy policy last updated | 2024-08-27 | no date given |
| 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 | 10 stars |
| Agent reviews | 3.3/5 (4) | 4.3/5 (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.

**Fireworks AI Inference.** Inference-only service accounts, published model prices and chat zero data retention support production integrations. Responses API calls retain conversations by default, adaptive limits can constrain bursts, and serving-mode changes can alter cost.

## 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.

### Fireworks AI Inference

1. Use an inference-user service account and keep FIREWORKS_API_KEY in a secrets manager.
2. Use https://api.fireworks.ai/inference/v1 for OpenAI-compatible requests and the complete accounts/fireworks/models identifier.
3. Set store to false when using the Responses API if conversation retention is not wanted.
4. Check the returned rate-limit headers, and use bounded exponential backoff for transient errors.
5. Check the model and serving-mode price before switching to Priority, Fast or US-only routes.

## Questions

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

Fireworks AI Inference scores 73.5 (BB) on agent readiness against Cerebras Inference's 68.4 (B), and leads in 3 of 7 scored categories. Cerebras Inference leads on agent ergonomics.

### Do Cerebras Inference and Fireworks AI Inference need an API key?

Both need an API key.

### Can an agent call Cerebras Inference and Fireworks AI Inference without installing anything?

Yes. Cerebras Inference has a hosted endpoint at https://api.cerebras.ai/v1 and Fireworks AI Inference at https://api.fireworks.ai/inference/v1.


## For agents

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

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