NextStep-1.1

The model for text-to-image generation represents an improved version of the previous NextStep-1 model. It was developed to enhance image quality and address visualization issues inherent in earlier versions.  

Key features:  

  • Improved Image Quality: A Flow-based Reinforcement Learning (RL) approach is applied post-training, significantly enhancing texture detail and reducing visual artifacts. Results are now more "professional" and "clean" compared to the previous version.  
  • Enhanced Stability: Numerical instability issues associated with the use of autoregressive flow-based models during RL have been resolved.

Announce Date: 23.12.2025
Parameters: 15B
Developer: StepFun
vLLM-Omni Version: 0.16.0
License: Apache 2.0

Public endpoint

Use our pre-built public endpoints for free to test inference and explore NextStep-1.1 capabilities. You can obtain an API access token on the token management page after registration and verification.
Model Name Context Type GPU Status Link
There are no public endpoints for this model yet.

Private server

Rent your own physically dedicated instance with hourly or long-term monthly billing.

We recommend deploying private instances in the following scenarios:

  • maximize endpoint performance,
  • enable full context for long sequences,
  • ensure top-tier security for data processing in an isolated, dedicated environment,
  • use custom weights, such as fine-tuned models or LoRA adapters.

Recommended server configurations for hosting NextStep-1.1

Prices:
Name GPU Price, hour Generation time, sec.
teslav100-1.12.64.160 1 $1.20 Launch
rtx5090-1.16.64.160 1 $1.59 Launch
teslaa100-1.16.64.160 1 $2.37 Launch
h100-1.16.64.160 1 $3.83 Launch
h100nvl-1.16.96.160 1 $4.11 Launch
h200-1.16.128.160 1 $4.74 Launch
Prices:
Name GPU Price, hour Generation time, sec.
teslat4-1.16.16.160 1 $0.33 Launch
teslaa2-1.16.32.160 1 $0.38 Launch
teslaa10-1.16.32.160 1 $0.53 Launch
rtx3090-1.16.24.160 1 $0.83 Launch
rtx4090-1.16.32.160 1 $1.02 Launch
teslav100-1.12.64.160 1 $1.20 Launch
rtx5090-1.16.64.160 1 $1.59 Launch
teslaa100-1.16.64.160 1 $2.37 Launch
h100-1.16.64.160 1 $3.83 Launch
h100nvl-1.16.96.160 1 $4.11 Launch
h200-1.16.128.160 1 $4.74 Launch
Prices:
Name GPU Price, hour Generation time, sec.
teslat4-1.16.16.160 1 $0.33 Launch
rtx2080ti-1.10.16.500 1 $0.38 Launch
teslaa2-1.16.32.160 1 $0.38 Launch
teslaa10-1.16.32.160 1 $0.53 Launch
rtx3080-1.16.32.160 1 $0.57 Launch
rtx3090-1.16.24.160 1 $0.83 Launch
rtx4090-1.16.32.160 1 $1.02 Launch
teslav100-1.12.64.160 1 $1.20 Launch
rtx5090-1.16.64.160 1 $1.59 Launch
teslaa100-1.16.64.160 1 $2.37 Launch
h100-1.16.64.160 1 $3.83 Launch
h100nvl-1.16.96.160 1 $4.11 Launch
h200-1.16.128.160 1 $4.74 Launch

Related models

Need help?

Contact our dedicated neural networks support team at nn@immers.cloud or send your request to the sales department at sale@immers.cloud.