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InfermaticvsStepFun

Infermatic vs StepFun: Token Pricing, Speed & Intelligence

Full comparison of Infermatic and StepFun — live token pricing, latency, throughput, context window, strengths, weaknesses, and best use cases. Rates sourced from public APIs — verify before use.

Infermatic

Uncensored open-weight inference — RP, creative writing, and unrestricted model access

Infermatic is a specialized LLM inference provider focused on uncensored and minimally-filtered open-weight models, serving the roleplay, creative writing, and adult content communities. It hosts a curated catalog of fine-tuned Llama, Mistral, and Qwen variants optimized for creative and RP use cases, with OpenAI-compatible API access. Infermatic offers competitive per-token pricing with no content filtering on supported models, making it a go-to provider for use cases that mainstream APIs decline.

RoleplayCreative writingAdult contentUncensored inferenceOpen-weight models
Open-weight hostHosts open weights

StepFun

Step-5 — Chinese frontier LLM with strong multimodal and reasoning capability

StepFun is a Chinese AI startup developing the Step model series. Step-5 Preview is the frontier tier, competing with top Chinese and international models on reasoning and multimodal benchmarks. Step-3.7 Flash is the efficient tier for cost-sensitive workloads. StepFun is backed by Tencent and focuses on enterprise and developer API access.

ReasoningChinese NLPMultimodal tasksCost-sensitive inference
Proprietary models

Key metric comparison

Infermatic
StepFun
Cheapest input ($/1M)

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Cheapest output ($/1M)

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Peak throughput

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Best latency (TTFT)

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Intelligence score

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Context window

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Live token pricing

Strengths and weaknesses

Infermatic

Uncensored and minimally-filtered model access for creative and RP use cases
Curated catalog of RP-optimized fine-tunes (Llama, Mistral, Qwen variants)
OpenAI-compatible API — easy integration with existing tooling
Competitive per-token pricing for open-weight models
No content filtering on supported models
Not suitable for enterprise or compliance-sensitive workloads
Smaller model catalog than Together AI or OpenRouter
Less infrastructure redundancy than larger providers

StepFun

Step-5 Preview is competitive with top Chinese frontier models on reasoning benchmarks
Step-3.7 Flash at $0.20/$1.15 per 1M tokens offers strong value for efficient inference
Multimodal capability on Step-5 (text, image, video understanding)
Backed by Tencent with enterprise-grade infrastructure
Newer entrant — smaller track record than established frontier labs
Documentation and support primarily in Chinese
Limited international ecosystem and third-party integrations

Key differentiators

Infermatic

The leading inference API for uncensored open-weight models — purpose-built for roleplay, creative writing, and adult content use cases that mainstream providers decline to serve.

StepFun

Step-5 is StepFun's frontier reasoning model with multimodal capability, backed by Tencent — positioned as a competitive alternative to Qwen and ERNIE for Chinese enterprise workloads.

Frequently asked questions

Infermatic FAQs

What is Infermatic?

Infermatic is an LLM inference provider specializing in uncensored and minimally-filtered open-weight models for roleplay, creative writing, and adult content use cases. It offers OpenAI-compatible API access to curated RP-optimized fine-tunes.

What models does Infermatic offer?

Infermatic hosts RP-optimized fine-tunes of Llama 4, Mistral, Qwen3, and other open-weight base models. The catalog focuses on models fine-tuned for creative writing, character roleplay, and adult content generation.

Is Infermatic API OpenAI-compatible?

Yes. Infermatic provides an OpenAI-compatible REST API, so you can use it as a drop-in replacement in any application that supports custom base URLs — including LangChain, LlamaIndex, and most AI frameworks.

StepFun FAQs

What is StepFun?

StepFun is a Chinese AI startup backed by Tencent, developing the Step model series. Step-5 Preview is the frontier tier and Step-3.7 Flash is the efficient tier, both available via the StepFun API.

How much does the StepFun API cost?

Step-5 Preview is $1.00/$2.70 per 1M input/output tokens. Step-3.7 Flash is $0.20/$1.15 per 1M tokens. See platform.stepfun.com/docs/pricing for current rates.

Does Step-5 support multimodal input?

Yes. Step-5 Preview supports text, image, and video understanding in a single API call, making it suitable for multimodal enterprise applications.

Provider resources

Infermatic

Provider page
Website
PricingDocs

StepFun

Provider page
Website
PricingDocs

Infermatic — Uncensored open-weight inference — RP, creative writing, and unrestricted model access

Infermatic is a specialized LLM inference provider focused on uncensored and minimally-filtered open-weight models, serving the roleplay, creative writing, and adult content communities. It hosts a curated catalog of fine-tuned Llama, Mistral, and Qwen variants optimized for creative and RP use cases, with OpenAI-compatible API access. Infermatic offers competitive per-token pricing with no content filtering on supported models, making it a go-to provider for use cases that mainstream APIs decline.

The leading inference API for uncensored open-weight models — purpose-built for roleplay, creative writing, and adult content use cases that mainstream providers decline to serve.

StepFun — Step-5 — Chinese frontier LLM with strong multimodal and reasoning capability

StepFun is a Chinese AI startup developing the Step model series. Step-5 Preview is the frontier tier, competing with top Chinese and international models on reasoning and multimodal benchmarks. Step-3.7 Flash is the efficient tier for cost-sensitive workloads. StepFun is backed by Tencent and focuses on enterprise and developer API access.

Step-5 is StepFun's frontier reasoning model with multimodal capability, backed by Tencent — positioned as a competitive alternative to Qwen and ERNIE for Chinese enterprise workloads.

Key strengths compared

Infermatic

  • Uncensored and minimally-filtered model access for creative and RP use cases
  • Curated catalog of RP-optimized fine-tunes (Llama, Mistral, Qwen variants)
  • OpenAI-compatible API — easy integration with existing tooling
  • Not suitable for enterprise or compliance-sensitive workloads
  • Smaller model catalog than Together AI or OpenRouter

StepFun

  • Step-5 Preview is competitive with top Chinese frontier models on reasoning benchmarks
  • Step-3.7 Flash at $0.20/$1.15 per 1M tokens offers strong value for efficient inference
  • Multimodal capability on Step-5 (text, image, video understanding)
  • Newer entrant — smaller track record than established frontier labs
  • Documentation and support primarily in Chinese

Key weaknesses compared

Infermatic

  • Not suitable for enterprise or compliance-sensitive workloads
  • Smaller model catalog than Together AI or OpenRouter
  • Less infrastructure redundancy than larger providers

StepFun

  • Newer entrant — smaller track record than established frontier labs
  • Documentation and support primarily in Chinese
  • Limited international ecosystem and third-party integrations

Provider category context

Infermatic is a open source host, founded in 2023. StepFun is a frontier lab, founded in 2023. The category difference means these providers serve partially overlapping use cases — compare the model lists and pricing tables above to find the best fit for your specific workload.

How to choose between them

Choose Infermatic if you need uncensored and minimally-filtered model access for creative and rp use cases. Choose StepFun if you need Chinese NLP. For high-volume production workloads, run a cost comparison using the token pricing table above with your actual prompt/completion token ratio — the cheapest provider depends heavily on your input-to-output token ratio.