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NO.: #4d8cf752
Topic: MODELS & API
Source: Simon Willison
Published: 2026-04-23 19:59:47
Importance: ★ 10/10 — radar 100
Original: simonwillison.net/2026/Apr/23/gpt-5-5/#atom-everything

GPT-5.5 launches in Codex and ChatGPT, while API access remains pending

The post frames GPT-5.5 as a strong new model already available in Codex and rolling out to paid ChatGPT users, but notably not yet in the public API. For indie developers, the key takeaway is that access may currently depend more on subscription-linked Codex paths than on standard API workflows, which creates both opportunity and platform risk.

[ KEY POINTS ]

GPT-5.5 is presented as a fast and highly capable new model, which makes this notable as a model-release signal.
The standard API is not available yet, so developers cannot rely on the usual clean API-based evaluation and product integration path.
A semi-official Codex-specific endpoint tied to ChatGPT subscriptions appears to be tolerated or supported, which may lower short-term experimentation costs for indie hackers.
That access path is strategically useful but fragile, because it depends on product-specific mechanisms rather than a fully announced public API contract.

Originalsimonwillison.net/2026/Apr/23/gpt-5-5/#atom-everythingRead original →

// related

#0001
#0001Models & API r/LocalLLaMA5 hours ago
`Qwen3.7 Max` hits 5th on Artificial Analysis; 27B/35B still pending
60radar
Qwen3.7 MaxLarge language model — high-end Alibaba Qwen variant
Artificial Analysis puts it near GPT 5.4 xhigh and above Gemini 3.5 Flash. Strong benchmark signal, but migration waits on API price and smaller-model results.
- Ranked 5th on Artificial Analysis, roughly tied with GPT 5.4 xhigh; credible enough to add to model eval lists.
- Gemini 3.5 Flash sits one step lower in the cited ranking, so latency/price will decide the practical winner.
- Qwen3.6 27B trails Max by 6 points; the 27B/35B Qwen3.7 results matter for local or cheaper deployment.
Source: www.reddit.com/r/LocalLLaMA/comments/1tie6gy/qwen37_max_Read original →
60radar
PHOTO
FIG-0011:1
#0002
#0002Models & API Simon Willison13 hours ago
`llm-gemini` `0.32` adds `gemini-3.5-flash`
50radar
llm-geminiLLM CLI plugin — calls Gemini models from `llm`
Simon Willison's llm CLI can now call Google's new Flash model through the Gemini plugin. Small update, but useful if your scripts already depend on llm.
- llm-gemini now exposes gemini-3.5-flash, so existing llm CLI workflows can test the model without custom API glue.
- Scope is one model alias in a plugin release. This is practical plumbing, not a new app-building capability by itself.
- Best fit is quick model comparison for summaries, extraction, and generation jobs already wired around Simon Willison's llm ecosystem.
Source: simonwillison.net/2026/May/19/llm-gemini-2/#atom-everythRead original →
50radar
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FIG-0021:1
#0003
#0003Models & API Simon Willison14 hours ago
`Gemini 3.5 Flash` ships broadly with a 3-6x price jump
90radar
Google is putting the new default-grade model into Search, Gemini, Android Studio, and the API. The API math changed: high-output features need a fresh margin check.
- Model ID is gemini-3.5-flash; it supports 1,048,576 input tokens and 65,536 output tokens. Strong fit for long-context document flows.
- Pricing is $1.50/M input and $9/M output, 3x 3 Flash Preview and 6x 3.1 Flash-Lite. Flash is no longer the obvious cheap default.
- Interactions API is in beta with server-side history management, echoing the Responses API pattern. Agent backends may get simpler state handling.
- No computer-use feature in this release. If your workflow depends on browser/desktop control, this is a model upgrade, not a full agent-runtime replacement.
- 3.5 Pro is slated for next month, likely pricier. Build model routing now instead of hard-coding one Gemini tier.
Source: simonwillison.net/2026/May/19/gemini-35-flash/#atom-everRead original →
FIG-0031:1
90radar
FIG-0031:1

GPT-5.5 launches in Codex and ChatGPT, while API access remains pending

// related

`Qwen3.7 Max` hits 5th on Artificial Analysis; 27B/35B still pending

`llm-gemini` `0.32` adds `gemini-3.5-flash`

`Gemini 3.5 Flash` ships broadly with a 3-6x price jump