C

ChatGPT

⭐⭐⭐⭐⭐ 4.9/5

The world's most popular AI chatbot by OpenAI. Default: GPT-5.5 Instant, Latest: GPT-5.6

chatbotwritingcodinganalysis
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Developer

OpenAI

Released

Nov 2022

Users

800M+

API

Available

📊 Rating Breakdown

Functionality 5.0/5

GPT-4o, o1, plugins, custom GPTs, DALL-E 3, browsing - most capable AI assistant ever

Ease of Use 4.9/5

Clean intuitive interface, perfect for beginners and experts

Performance 4.8/5

Fast responses, excellent context handling, very reliable

Value for Money 4.7/5

Free tier is excellent, Plus $20/mo is worth it for power users

Ecosystem 5.0/5

Largest ecosystem, massive plugin store, API integrations, custom GPT marketplace

Privacy & Security 4.3/5

Good controls, but data usage concerns persist, VPN needed in some regions

Support 4.6/5

Great docs, strong community, responsive help center

Innovation 5.0/5

Industry leader, sets the standard for AI development

✅ Pros

  • Versatile and all-in-one AI solution
  • Massive ecosystem with plugins and GPTs
  • Regular updates with new capabilities
  • Excellent integration with DALL-E for image generation
  • Strong multi-modal capabilities for text and images
  • Large user community and extensive documentation
  • Web browsing capability for up-to-date information
  • Custom GPTs for specialized use cases

❌ Cons

  • Can generate incorrect information (hallucinations)
  • Plus subscription is relatively expensive
  • Free tier has rate limits
  • Occasional context window issues with very long text
  • Not as privacy-focused as some alternatives
  • Requires VPN access in some regions
  • Customer support can be slow
  • Model selection is limited in the free tier

💰 Pricing

GPT-5.5 Instant: Free | GPT-5.6: $2.50/1M input | Plus: $20/mo

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🧠 Available Models

GPT-5.5 Instant

Proprietary

OpenAI's default ChatGPT model (Apr 2026). Free for all users. Improved reliability, 52% fewer hallucinations, better at suggestions, comparisons, and everyday tasks.

Parameters: Not disclosed
Context: 128K tokens
📝 text 🖼️ image 🎤 audio 🎬 video
✅ 52% fewer hallucinations ✅ Free for all users ✅ Better suggestions ✅ Everyday tasks
Free: ChatGPT
API Input: $0.50/1M tokens
API Output: $2/1M tokens
🔌 API Availablevia OpenAI API

GPT-5.6

Proprietary

OpenAI's latest flagship model (2026). Released Jun 26, 2026. Currently limited to government-approved partners only. Not publicly available. Breakthrough reasoning, agentic capabilities, extended memory, and deep tool integration across all modalities.

Parameters: Not disclosed
Context: 256K tokens
📝 text 🖼️ image 🎤 audio 🎬 video
✅ State-of-the-art reasoning ✅ Agentic tasks ✅ Full multimodal ✅ Tool use
Input: $7.50/1M tokens
Output: $30/1M tokens
🔌 API Availablevia OpenAI API, Azure OpenAI

GPT-5

Proprietary

Major release (Feb 2025). Enhanced reasoning, deeper context understanding, and improved multimodal capabilities. Served as default model before GPT-5.5 Instant.

Parameters: Not disclosed
Context: 128K tokens
📝 text 🖼️ image 🎤 audio 🎬 video
✅ Advanced reasoning ✅ Multimodal ✅ Large context ✅ High reliability
Input: $2.50/1M tokens
Output: $10/1M tokens
🔌 API Availablevia OpenAI API

GPT-4o

Proprietary

Omni model with native multimodal input/output. Real-time voice, vision, and text. GPT-4 level intelligence. Legacy model.

Parameters: Not disclosed
Context: 128K tokens
📝 text 🖼️ image 🎤 audio
✅ Real-time voice ✅ Vision understanding ✅ Fast responses ✅ Cost-effective
Input: $2.50/1M tokens
Output: $10/1M tokens
🔌 API Availablevia OpenAI API, Azure OpenAI

GPT-4o Mini

Proprietary

Small, fast, and affordable model. Ideal for simple tasks, customer support, and high-volume applications.

Parameters: Not disclosed
Context: 128K tokens
📝 text 🖼️ image
✅ Very cheap ✅ Fast ✅ Efficient ✅ High volume
Input: $0.15/1M tokens
Output: $0.60/1M tokens
🔌 API Availablevia OpenAI API, Azure OpenAI

o1

Proprietary

Advanced reasoning model using chain-of-thought for complex math, science, and coding problems. Slower but more thorough.

Parameters: Not disclosed
Context: 200K tokens
📝 text 🖼️ image
✅ Math proofs ✅ Scientific reasoning ✅ Complex coding ✅ PhD-level reasoning
Input: $15/1M tokens
Output: $60/1M tokens
🔌 API Availablevia OpenAI API, Azure OpenAI

o3 / o3-mini

Proprietary

Next-gen reasoning model with breakthrough performance. o3-mini is fast and cheap, o3 is the most capable. Retiring Aug 2026.

Parameters: Not disclosed
Context: 200K tokens
📝 text
✅ Elite reasoning ✅ Competition math ✅ Scientific research
Input: $10/1M tokens (o3-mini) / $20/1M (o3)
Output: $40/1M tokens (o3-mini) / $80/1M (o3)
🔌 API Availablevia OpenAI API

DALL-E 3

Proprietary

Text-to-image generation model integrated with ChatGPT and available via API. Creates photorealistic and artistic images from text prompts.

Parameters: Not disclosed
Context: N/A (image generation)
📝 text
✅ Photorealistic generation ✅ Text rendering in images ✅ Prompt following
Input: $0.040/image (1024×1024)
Output: $0.080/image (1792×1024)
🔌 API Availablevia OpenAI API

Whisper

Open Source

State-of-the-art speech-to-text model. Supports 99+ languages, robust to noise, accents, and technical language.

Parameters: 1.55B (large-v3)
Context: N/A (audio)
🎤 audio
✅ Multilingual speech recognition ✅ Translation ✅ Robust
Input: $0.006/minute
Output: N/A
🔌 API Availablevia OpenAI API

TTS (Text-to-Speech)

Proprietary

Natural-sounding text-to-speech with 6 preset voices. Two model variants: tts-1 (fast) and tts-1-hd (high quality).

Parameters: Not disclosed
Context: N/A (TTS)
📝 text
✅ Natural voices ✅ Multi-language ✅ Streaming support
Input: $15/1M chars (tts-1) / $30/1M chars (tts-1-hd)
Output: N/A
🔌 API Availablevia OpenAI API

GPT-4.5

Proprietary retired - Jun 2026

"Highest EQ" model with deepest world knowledge and emotional intelligence. Retired Jun 2026 from API.

Parameters: Not disclosed
Context: 128K tokens
📝 text 🖼️ image
✅ Emotional intelligence ✅ Nuanced writing ✅ Creative content
Input: $75/1M tokens
Output: $150/1M tokens
🔌 API Availablevia OpenAI API

GPT-4.1

Proprietary

Lower-cost alternative to GPT-4.5, optimized for agents and developers. Better at following instructions and structured outputs.

Parameters: Not disclosed
Context: 1M tokens
📝 text
✅ Long context ✅ Agentic tasks ✅ Structured output ✅ Cost-effective
Input: $2/1M tokens
Output: $8/1M tokens
🔌 API Availablevia OpenAI API

API Quickstart Guide

Visit the official API documentation to get started with this tool.

🧠 Available Models

GPT-5.5 Instant

Proprietary

OpenAI's default ChatGPT model (Apr 2026). Free for all users. Improved reliability, 52% fewer hallucinations, better at suggestions, comparisons, and everyday tasks.

Parameters: Not disclosed
Context: 128K tokens
📝 text 🖼️ image 🎤 audio 🎬 video
✅ 52% fewer hallucinations ✅ Free for all users ✅ Better suggestions ✅ Everyday tasks
Free: ChatGPT
API Input: $0.50/1M tokens
API Output: $2/1M tokens
🔌 API Availablevia OpenAI API

GPT-5.6

Proprietary

OpenAI's latest flagship model (2026). Released Jun 26, 2026. Currently limited to government-approved partners only. Not publicly available. Breakthrough reasoning, agentic capabilities, extended memory, and deep tool integration across all modalities.

Parameters: Not disclosed
Context: 256K tokens
📝 text 🖼️ image 🎤 audio 🎬 video
✅ State-of-the-art reasoning ✅ Agentic tasks ✅ Full multimodal ✅ Tool use
Input: $7.50/1M tokens
Output: $30/1M tokens
🔌 API Availablevia OpenAI API, Azure OpenAI

GPT-5

Proprietary

Major release (Feb 2025). Enhanced reasoning, deeper context understanding, and improved multimodal capabilities. Served as default model before GPT-5.5 Instant.

Parameters: Not disclosed
Context: 128K tokens
📝 text 🖼️ image 🎤 audio 🎬 video
✅ Advanced reasoning ✅ Multimodal ✅ Large context ✅ High reliability
Input: $2.50/1M tokens
Output: $10/1M tokens
🔌 API Availablevia OpenAI API

GPT-4o

Proprietary

Omni model with native multimodal input/output. Real-time voice, vision, and text. GPT-4 level intelligence. Legacy model.

Parameters: Not disclosed
Context: 128K tokens
📝 text 🖼️ image 🎤 audio
✅ Real-time voice ✅ Vision understanding ✅ Fast responses ✅ Cost-effective
Input: $2.50/1M tokens
Output: $10/1M tokens
🔌 API Availablevia OpenAI API, Azure OpenAI

GPT-4o Mini

Proprietary

Small, fast, and affordable model. Ideal for simple tasks, customer support, and high-volume applications.

Parameters: Not disclosed
Context: 128K tokens
📝 text 🖼️ image
✅ Very cheap ✅ Fast ✅ Efficient ✅ High volume
Input: $0.15/1M tokens
Output: $0.60/1M tokens
🔌 API Availablevia OpenAI API, Azure OpenAI

o1

Proprietary

Advanced reasoning model using chain-of-thought for complex math, science, and coding problems. Slower but more thorough.

Parameters: Not disclosed
Context: 200K tokens
📝 text 🖼️ image
✅ Math proofs ✅ Scientific reasoning ✅ Complex coding ✅ PhD-level reasoning
Input: $15/1M tokens
Output: $60/1M tokens
🔌 API Availablevia OpenAI API, Azure OpenAI

o3 / o3-mini

Proprietary

Next-gen reasoning model with breakthrough performance. o3-mini is fast and cheap, o3 is the most capable. Retiring Aug 2026.

Parameters: Not disclosed
Context: 200K tokens
📝 text
✅ Elite reasoning ✅ Competition math ✅ Scientific research
Input: $10/1M tokens (o3-mini) / $20/1M (o3)
Output: $40/1M tokens (o3-mini) / $80/1M (o3)
🔌 API Availablevia OpenAI API

DALL-E 3

Proprietary

Text-to-image generation model integrated with ChatGPT and available via API. Creates photorealistic and artistic images from text prompts.

Parameters: Not disclosed
Context: N/A (image generation)
📝 text
✅ Photorealistic generation ✅ Text rendering in images ✅ Prompt following
Input: $0.040/image (1024×1024)
Output: $0.080/image (1792×1024)
🔌 API Availablevia OpenAI API

Whisper

Open Source

State-of-the-art speech-to-text model. Supports 99+ languages, robust to noise, accents, and technical language.

Parameters: 1.55B (large-v3)
Context: N/A (audio)
🎤 audio
✅ Multilingual speech recognition ✅ Translation ✅ Robust
Input: $0.006/minute
Output: N/A
🔌 API Availablevia OpenAI API

TTS (Text-to-Speech)

Proprietary

Natural-sounding text-to-speech with 6 preset voices. Two model variants: tts-1 (fast) and tts-1-hd (high quality).

Parameters: Not disclosed
Context: N/A (TTS)
📝 text
✅ Natural voices ✅ Multi-language ✅ Streaming support
Input: $15/1M chars (tts-1) / $30/1M chars (tts-1-hd)
Output: N/A
🔌 API Availablevia OpenAI API

GPT-4.5

Proprietary retired - Jun 2026

"Highest EQ" model with deepest world knowledge and emotional intelligence. Retired Jun 2026 from API.

Parameters: Not disclosed
Context: 128K tokens
📝 text 🖼️ image
✅ Emotional intelligence ✅ Nuanced writing ✅ Creative content
Input: $75/1M tokens
Output: $150/1M tokens
🔌 API Availablevia OpenAI API

GPT-4.1

Proprietary

Lower-cost alternative to GPT-4.5, optimized for agents and developers. Better at following instructions and structured outputs.

Parameters: Not disclosed
Context: 1M tokens
📝 text
✅ Long context ✅ Agentic tasks ✅ Structured output ✅ Cost-effective
Input: $2/1M tokens
Output: $8/1M tokens
🔌 API Availablevia OpenAI API

API Quickstart Guide

Visit the official API documentation to get started with this tool.

📜 Version History

Sep 2024 o1 Preview

o1 Reasoning Model

Launched o1-preview and o1-mini with advanced reasoning capabilities for complex problem-solving.

Sep 2023 DALL-E 3 & Voice

Multimodal Upgrade

Integrated DALL-E 3 for image generation, voice conversations, and browsing capabilities for Plus users.

Nov 2023 GPTs & GPT-4 Turbo

GPTs Store & GPT-4 Turbo

Launched custom GPTs, GPT Store, and GPT-4 Turbo with 128K context window and lower pricing.

Nov 2022 GPT-3.5

ChatGPT Launch

OpenAI launched ChatGPT based on GPT-3.5, a conversational AI that quickly became the fastest-growing app in history.

May 2024 GPT-4o

GPT-4o Launch

Released GPT-4o (omni) with multimodal capabilities, real-time voice, and vision at GPT-4 level for all users.

May 2023 iOS

iOS App Launch

Released official iOS app with voice input support, later becoming one of the most downloaded apps.

Mar 2023 GPT-4

GPT-4 Integration

Upgraded to GPT-4 for Plus users, bringing significant improvements in reasoning, creativity, and accuracy.

Jun 2025 GPT-5 Turbo

GPT-5 Turbo

Faster and more efficient version of GPT-5 with 256K context window and real-time collaboration features.

Jul 2023 Custom Instructions

Custom Instructions Feature

Added custom instructions allowing users to set persistent preferences and context for all conversations.

Feb 2025 GPT-5

GPT-5 Release

Major leap with GPT-5 featuring enhanced reasoning, deeper context understanding, and improved multimodal capabilities.

Feb 2024 Sora & Memory

Sora Video & Memory Feature

Integrated Sora video generation capabilities and introduced memory feature for personalized conversations.

Feb 2023 Plus

ChatGPT Plus

Introduced ChatGPT Plus subscription ($20/month) with priority access, faster response times, and early access to new features.

Dec 2025 o3

o3 Reasoning Model

Next-generation reasoning model with breakthrough performance on complex mathematical and scientific problems.

Apr 2026 GPT-5.5 Pro

GPT-5.5 Pro Update

Enhanced GPT-5.5 with improved agentic capabilities, extended memory, and deeper tool integration.

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