---
title: "Perplexity API Low, medium, and high presets now use GPT-6 models: 2026-09-25 | Harbyn"
description: "Perplexity API Low, medium, and high presets now use GPT-6 models, announced Sep 25, 2026."
canonical: "https://harbyn.com/changes/perplexity/2026-09-25-low-medium-and-high-presets-use-gpt-6-the-agent-api-low-medium-and-high-presets"
last-updated: 2026-10-02
---

# Perplexity API Low, medium, and high presets now use GPT-6 models

Markdown version of <https://harbyn.com/changes/perplexity/2026-09-25-low-medium-and-high-presets-use-gpt-6-the-agent-api-low-medium-and-high-presets>.

Behavior change - Perplexity API. low severity. Announced.

The Agent API low and medium presets now use openai/gpt-6-luna instead of openai/gpt-5.6-luna, and the high preset now uses openai/gpt-6-sol instead of openai/gpt-5.6-sol. Prompts, reasoning effort, tools, token budgets, and step limits are unchanged.

## Facts

| Fact | Value |
| --- | --- |
| Vendor | [Perplexity API](https://harbyn.com/vendors/perplexity.md) |
| Kind | Behavior change |
| Severity | low |
| Status | Announced |
| Announced | Sep 25, 2026 |
| Added to Harbyn | Oct 2, 2026 |
| Lead time | No dated deadline |
| Review | Reviewed by a person, extracted by a model |

## Find it in your code

```sh
npx harbyn scan
```

This change names no identifier the scanner can match line by line, so the scan tells you whether your repository uses Perplexity API, from its packages and API hosts. Nothing leaves your machine.

## Sources

Where this event comes from: the page we read, when we read it, and the hash of that snapshot.

- <https://docs.perplexity.ai/docs/resources/changelog/rss.xml> (changelog, fetched 2026-10-02 02:33 UTC, sha256 `a639ff52d155e27327358663168d7a30d0d18a1a787ed51e2cec5d1a90528fe1`)

## Related changes

### More from Perplexity API

- [Fast preset now uses Fast Search](https://harbyn.com/changes/perplexity/2026-09-25-fast-preset-uses-fast-search-the-agent-api-fast-preset-now-uses-fast-search-sear.md) (Behavior change, announced Sep 25, 2026)
- [older OpenAI models retired from the Agent and Router APIs on October 24, 2026](https://harbyn.com/changes/perplexity/2026-09-25-older-openai-models-retired-october-24-2026.md) (Retirement, effective Oct 24, 2026)
- [Agent API responses now report sandbox extraction usage and cost](https://harbyn.com/changes/perplexity/2026-10-05-accurate-sandbox-extraction-usage-and-costs-agent-api-responses-now-include-mode.md) (Behavior change, announced Oct 5, 2026)
- [Decisions API requests for pplx-decider-v1.1-27b now use pplx-decider-v1.2](https://harbyn.com/changes/perplexity/2026-10-16-decisions-api-pplx-decider-v1-2-and-pplx-decider-flash-v1-2-pplx-decider-v1-2-re.md) (Behavior change, announced Oct 16, 2026)

### Changes at other vendors

- [Amazon Selling Partner API: ORDER\_CHANGE notifications add PreFulfillmentStatusChange for Amazon Autos](https://harbyn.com/changes/amazon-sp-api/2026-10-14-sp-api-updates-new-listings-items-api-ivp-values-in-eu5-jp-and-ca-stores-oct-3.md) (effective Oct 28, 2026)
- [BigCommerce: 301 redirects will apply only to storefront channels](https://harbyn.com/changes/bigcommerce/2026-10-07-301-redirects-now-apply-to-storefront-channels-only.md) (effective Nov 10, 2026)
- [GitHub: Secret scanning audit log business field changes to enterprise slug](https://harbyn.com/changes/github/2026-10-20-updates-to-github-secret-scanning-7.md) (effective Nov 12, 2026)
- [Jira / Atlassian Cloud: New IP address ranges in use from January 1, 2027](https://harbyn.com/changes/atlassian-jira/2026-10-16-atlassian-cloud-adds-new-ip-address-ranges.md) (effective Jan 1, 2027)

[All upcoming deadlines](https://harbyn.com/deadlines.md)