ChatGPT モデル選択 2026：Plus/Pro で web・アプリの picker から Instant・推論・Pro モデルを選ぶ
Plus/Pro 確認 → picker 表示 → Instant か推論 → Configure 調整。
You subscribed to ChatGPT Plus or ChatGPT Pro on chatgpt.com but cannot find Extra High or Pro models in the menu? OpenAI documents the in-chat model picker on web and official apps—where it appears, what Plus vs Pro can select, and how Configure handles Instant and legacy models.
This how-to follows OpenAI Help Center only: “ChatGPT — Release Notes” (6825453), “GPT-5.6 in ChatGPT”, “GPT-5.6 and GPT-6 Pro in ChatGPT” (20001354), and “About ChatGPT Pro tiers”. Model names and rollout timing change—trust the signed-in picker on your account.
Where the model picker lives
Release Notes (6825453) say: on the web, open the model menu from the message composer (the bar where you type). On mobile apps, the same control sits at the top of the chat. Free accounts see a smaller set; Plus, Pro, and eligible Business seats see reasoning levels and Pro-tier entries when your plan and rollout include them.
Plus vs Pro in the picker (official matrix)
| Picker option | Plus | Pro ($100 / $200) | Official source |
|---|---|---|---|
| Instant (fast default) | Yes | Yes | GPT-5.6 in ChatGPT · 6825453 |
| Medium / High reasoning (GPT-5.6 Sol family) | Included | Included | 20001354 |
| Extra High reasoning | Not included | Included | 20001354 |
| Pro models (e.g. GPT-5.6 Sol Pro, GPT-6 Pro in Chat) | Not in Chat picker | Included (allowances apply) | 20001354 · About ChatGPT Pro tiers |
| Instant → Medium auto-switch | When offered on paid plans | When offered | GPT-5.6 in ChatGPT |
| Legacy models | Via Configure when listed | Via Configure when listed | 6825453 |
Step-by-step: pick a model on chatgpt.com
- 1
Sign in and confirm your plan
Open chatgpt.com with your own OpenAI account. In Settings → Subscription (or the profile menu), confirm Plus or Pro. Business seats follow workspace assignment—check with your admin if the picker looks limited.
- 2
Open the model picker before you send
Start a new chat or open an existing one. On web, click the model name in the composer; on mobile, tap the model control at the top of the thread. If a model is greyed out, help text says you may have hit a usage allowance for that tier—your subscription stays active; try again later or pick another level.
- 3
Choose Instant for speed or reasoning for harder tasks
Help articles describe Instant for everyday, fast replies. For multi-step work, select a reasoning level (Medium / High on Plus; Extra High and Pro-only tiers on Pro where shown). Pick the level before you send the message—changing mid-thread starts a new behavior path for that turn.
- 4
Pro only: select Extra High or Pro models
Article 20001354 lists Extra High and Pro entries (including GPT-5.6 Sol Pro and GPT-6 Pro in Chat) for eligible Pro plans. “About ChatGPT Pro tiers” explains allowances and that GPT-6 Pro in Chat is not included on Plus. If Pro models are missing, confirm you are on a Pro tier that includes them and that rollout has reached your account.
- 5
Use Configure for Instant auto-switch and legacy
Open Configure from the picker (wording may be “Customize” or a gear icon). Help text lets eligible plans toggle Instant automatically switching to Medium on harder prompts, enable legacy models when offered, and set default thinking intensity for reasoning modes. Save and send a test prompt to verify behavior.
When the picker does not match the table
Gradual rollout
Release Notes warn that model lists roll out over time. Two Plus accounts may show different labels until OpenAI finishes deployment—refresh the app or sign out/in once before assuming a billing error.
Workspace admin locks
Business and Enterprise admins can limit which models members see. If you expect Pro models on a company seat, ask the workspace owner whether GPT-6 Pro or Extra High is enabled.
Wrong surface
Third-party apps, API keys, and older desktop builds may not expose the same picker. This guide is for chatgpt.com and official ChatGPT mobile apps only.
After you pick a model and draft copy with ChatGPT, sync with teammates on a whiteboard at wbstorm—see 部屋の作成と参加. Plan basics: ChatGPT Plus ガイド · ChatGPT Pro guide · ChatGPT Projects how-to.
# OpenAI Help Center (model picker)
# 6825453 — ChatGPT Release Notes (composer vs mobile)
# GPT-5.6 in ChatGPT — Instant, reasoning, Configure
# 20001354 — GPT-5.6 and GPT-6 Pro in ChatGPT
# About ChatGPT Pro tiers — allowances, Pro vs PlusCan Plus users select GPT-6 Pro in Chat?
Help text for GPT-6 Pro in Chat lists Pro, Business, and Enterprise tiers—not Plus. Plus keeps Medium/High reasoning where offered, not Pro-tier models in the Chat picker.
Why is my Pro model greyed out?
Help articles describe temporary unavailability when you reach a model-specific allowance. Your subscription remains; try another level or wait for the limit to reset per “About ChatGPT Pro tiers”.
Does the picker apply inside Projects?
Projects reuse chatgpt.com threads with project files and instructions. Model choice still uses the composer/top-of-chat picker for that conversation unless workspace policy blocks a model.
Is this a wbstorm feature?
No. This page explains OpenAI’s ChatGPT model picker only. wbstorm is a browser brainstorming room unrelated to OpenAI billing.