SylphxModels

OpenAI

GPT Mini family · v5

GPT-5 Mini

Retiring in 17d
openai/gpt-5-mini

GPT-5 Mini on Sylphx Models · 400K of context. One Responses contract, with list prices published per million tokens.

Released
Aug 7, 2025 · 413 days old
Retires
Oct 10, 2026 · 17 days left
Provider
OpenAI
Context
400,000 tokens
Open in the playgroundSee a request sampleRead the docs
Input $0.275 / MOutput $2.20 / MCached input $0.0275 / MFull rate sheet
Context window400,000tokens per request
Max output128,000tokens per response
Input$0.275 / Mper million tokens
Output$2.20 / Mper million tokens
Cached input$0.0275 / M90% off input
ReleasedAug 7, 2025413 days old

Pricing

USD per million tokens
Input
$0.275
Output
$2.20
Cached input
$0.0275

$0.76 for 750,000 input and 250,000 output tokens.

Assumption: one batch of 750,000 input plus 250,000 output tokens at the published list prices — recompute for your own mix. Blended $0.7563 per million at a 3:1 mix.

Chat replies · 3:1 input:output
$0.7563 / M
Long documents · 9:1 input:output
$0.4675 / M
Heavy output · 1:1 input:output
$1.238 / M
Cache write
Not published
Currency and unit
USD / million tokens

Cached input reads cost 90% less than fresh input tokens.

Full rate sheet and billing rules.

Specification

Context window
400,000 tokens
Max output
128,000 tokens
Input modalities
Not published
Output modalities
Not published
Family
GPT Mini
Version
v5
Provider
OpenAI
Released
Aug 7, 2025 · 413 days old
Model id
openai/gpt-5-mini

Data posture

Standard

By default, prompts and outputs sent to this model are not used to train models.

Training on what you send · default
No
Zero Data Retention · default
Yes
curl https://api.sylphx.ai/v1/responses \
  -H "Authorization: Bearer $SYLPHX_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "model": "openai/gpt-5-mini",
    "input": "Summarise this incident report in three bullets.",
    "stream": false
  }'

How to call it

Send the official Responses document to the base URL above with your organization key and this exact model id. Streaming arrives as ordered events with one terminal event.

  • Retries: send an Idempotency-Key and a retry replays the original response instead of billing twice.
  • Errors: typed envelopes tell you whether to retry, wait, or fix the request.
  • Keys: mint and revoke organization keys from the console.
QuickstartResponses APIErrors and retries

Related models

Derived from this catalog: same provider first, then the same family, then the nearest neighbours by input price and context window.

More from OpenAI

Same provider

Elsewhere in GPT Mini

Same family slug

Similar price and context

Nearest by input price and context window

Independent evaluation

We do not publish benchmark scores for this model — we have not verified any. These external leaderboards run their own tests, so check them against your own workload.

Not our numbers
Every OpenAI model →