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OpenAI · Language + Image model
GPT-5 Image Mini
openai/gpt-5-image-mini- Language
- Image
GPT-5 Image Mini combines OpenAI's advanced language capabilities, powered by [GPT-5 Mini](https://openrouter.ai/openai/gpt-5-mini), with GPT Image 1 Mini for efficient image generation. This natively multimodal model features superior instruction following, text...
As a language model
Specifications
- Context window
- 400,000 tokens
- Max output
- 128,000 tokens
- Input
- file, image, text
- Output
- image, text
- Reasoning
- always on
- Tokenizer
- GPT
- Moderation
- provider-moderated
Supported parameters
Accepted by the model and forwarded as-is by the gateway.
- frequency_penalty
- logit_bias
- logprobs
- max_tokens
- presence_penalty
- reasoning
- response_format
- seed
- stop
- structured_outputs
- temperature
- top_logprobs
- top_p
Use it
POST /api/v1/chat/completions · MCP chat · full reference
curl https://omnirail.org/api/v1/chat/completions \
-H "Authorization: Bearer $OMNIRAIL_KEY" -H "Content-Type: application/json" \
-d '{"model":"openai/gpt-5-image-mini","messages":[{"role":"user","content":"Hello"}],"max_tokens":300}'As an image model
Specifications
- Input
- file, image, text
- Output
- image, text
- Editing
- yes, up to 16 reference images
- Images per call
- 1 to 4
- Served by
- OpenAI
Request options
Validated against these values; anything else returns 400 with the allowed list.
- aspect_ratio
- 1:1, 3:2, 2:3, auto
- quality
- auto, low, medium, high
- background
- auto, transparent, opaque
- output_compression
- 0 to 100
Use it
POST /api/v1/images · /images/edits · MCP generate_image · edit_image · full reference
curl https://omnirail.org/api/v1/images \
-H "Authorization: Bearer $OMNIRAIL_KEY" -H "Content-Type: application/json" \
-d '{"model":"openai/gpt-5-image-mini","prompt":"a lighthouse at dawn, 35mm film","aspect_ratio":"1:1"}'