Here’s what you currently have access to based on tier: (from ChatGPT)
- Models / “modes” by plan
From the current pricing + GPT-5.1 docs: OpenAI+1
Free
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GPT-5.1 (Auto/Instant)
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You always have this, but with low message limits.
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Auto can quietly switch into “thinking” mode for some harder questions.
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GPT-5 thinking mini
- The smaller, faster fallback used when you hit 5.1 limits.
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No manual model picker
- You basically just see “GPT-5.1” in the UI; legacy models (GPT-4o, GPT-4.1, etc.) are not available to free users anymore. OpenAI Help Center
Limits:
- ~10 GPT-5.1 messages / 5 hours. After that, chats switch to the mini model until your limit resets. OpenAI Help Center
Plus (individual paid)
You pay monthly and get:
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Model picker access for GPT-5.1 family:
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GPT-5.1 Auto
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GPT-5.1 Instant
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GPT-5.1 Thinking (manually selectable, with its own weekly cap)
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Expanded access to GPT-5 thinking mini (faster reasoning model). OpenAI Help Center+1
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Legacy models (optional) when “Show additional models” is enabled:
- GPT-4o, GPT-4.1, OpenAI o3, o4-mini (in a “legacy / additional models” section). OpenAI Help Center+1
Limits:
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~160 GPT-5.1 messages / 3 hours (currently boosted, may drop later).
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GPT-5.1 Thinking: up to 3,000 messages/week when you pick that mode explicitly. Auto-switching into Thinking doesn’t count against this. OpenAI Help Center
Pro (higher-tier individual)
Everything in Plus, plus: OpenAI+2OpenAI Help Center+2
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GPT-5.1 Pro
- “Research-grade” version with deeper reasoning and larger context window.
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Effectively unlimited GPT-5.1 messages (subject to abuse guardrails). OpenAI Help Center+1
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More thinking-time presets (Light / Standard / Extended / Heavy).
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Faster / more generous use of:
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Image generation
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Deep research / agent-style tools
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Coding/Codex agent
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Sora 1 video generation access (within credit limits). OpenAI+1
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Extra legacy options: GPT-4.5, etc., when “Show additional models” is on. OpenAI Help Center
Business & Enterprise (team/org)
For completeness: OpenAI+2OpenAI Help Center+2
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Unlimited GPT-5.1 for the workspace.
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Flexible access to GPT-5.1 Thinking and GPT-5.1 Pro (charged via credits if on flexible pricing).
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Admin-controlled access to legacy models (GPT-4o, GPT-4.1, etc.).
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Huge context windows, connectors (Drive, Slack, SharePoint, GitHub, etc.), and enterprise security/compliance.