The AI model market in 2026 has three main players: OpenAI’s GPT-5.5 (launched on April 24), Anthropic’s Claude Opus 4.7 (launched on April 16), and Google’s Gemini 2.5 Pro and Flash. All three adopt a “flagship / mid-tier / lightweight” three-layer product line, but their positioning, pricing, and strengths differ. This article not only compares versions, but also the version differences within the same company—covering the most commonly asked questions like “ChatGPT version differences” and “differences between GPT versions.” With a single table plus three key takeaways, you can decide which provider to subscribe to in 5 minutes.
A table to understand the three companies’ flagship lineups (latest as of May 2026)
Tier OpenAI Anthropic Google Flagship (strongest) GPT-5.5 Pro Claude Opus 4.7 Gemini 2.5 Pro Mid-tier (daily use) GPT-5.5 Claude Sonnet 4.6 Gemini 2.5 Flash Lightweight (cheap) GPT-5.5-mini Claude Haiku 4.5 Gemini 2.5 Flash-Lite Context Window 1M tokens（GPT-5.5） 1M tokens（entire lineup） 2M tokens（Pro） Monthly fee (consumer) $20 Plus／$200 Pro $20 Pro／$100 Max $20 AI Pro Coding strengths Codex (built-in IDE) Claude Code (CLI＋desktop) Code Assist Creative writing More free, more variety Strictly follows instructions Medium Multimodal Sora 2 video integration Visual resolution 3x upgrade Native video, voice Traditional Chinese Smooth, strong knowledge base Rigorous and well-structured (4.7 token billing increases) Medium, occasionally mixed with Simplified Chinese
ChatGPT version differences: how GPT-5.5, 5.4, and 4o are divided?
“ChatGPT version differences” is one of the most searched questions by readers in Taiwan. OpenAI’s naming logic in 2026 is:
GPT-5.5 (launched 2026/4/24): current main model, default model for ChatGPT Plus subscribers, and the API has already been opened
GPT-5.5 Pro: flagship version, exclusive to ChatGPT Pro ($200/month), deeper reasoning, better than 5.5 for multi-step complex tasks
GPT-5.5-mini: cheaper version, used when running large volumes of tasks on the API
GPT-5.4-Cyber: a cybersecurity-only version launched on April 15; limited to verifiers/defenders, not for general users
GPT-4o (2024/5): previous-generation main model; still callable via API, but no longer the default in ChatGPT
GPT-4 Turbo (2023/11): older version; performance and cost have both been replaced by 5.5, but the API is still available
For ChatGPT Plus subscribers ($20/month), the default is GPT-5.5 and you can manually switch to GPT-5.5-mini to save money. If you need GPT-5.5 Pro, you must upgrade to ChatGPT Pro ($200/month). In Terminal-Bench, GPT-5.5 reaches 82.7%, topping the AA index; and for coding and agent tasks, it’s currently the strongest OpenAI option.
Main differences between 5.5 and 5.4: context increased from 200K to 1M, tool-use accuracy for agent tasks improved, while token cost stays the same. For daily users, 5.5 is a no-brainer upgrade with no reason to keep 5.4.
Differences among three Claude models: Opus 4.7, Sonnet 4.6, Haiku 4.5
Claude’s naming logic differs from ChatGPT. Anthropic releases its three models in parallel; they’re not “new versions replacing old ones,” but “parallel choices in different price/speed/ability tiers.”
Claude Opus 4.7 (2026/4/16): strongest reasoning, 3x visual resolution; SWE-bench 87.6%; API $5／$25
Claude Sonnet 4.6 (starting 2026/2): daily main model; Adaptive Thinking; API $3／$15
Claude Haiku 4.5 (starting 2026/3): fastest, cheapest; API $1／$5
All three are 1M context, and subscription users ($20 Pro／$100 Max) can switch freely. For a detailed comparison among the three, see the full “Claude model version comparison pillar.”
Opus 4.7 introduces a new tokenizer—using the same Traditional Chinese text consumes 37–47% more tokens than 4.6. Official rates remain unchanged, but actual billing will increase; Traditional Chinese users should test the real cost before switching.
How to choose within the Gemini 2.5 line: Pro, Flash, Flash-Lite
Google’s Gemini 2.5 was introduced at the end of 2025, and in 2026 became the main AI engine integrated with Google Cloud and Workspace. The three versions align with OpenAI and Claude like this:
Gemini 2.5 Pro: flagship; 2M token context (longest among the three); strong at “context integration across multiple Google services” (Gmail, Docs, Drive, Calendar in one flow)
Gemini 2.5 Flash: daily main model; 1M context; fast speed; moderate cost
Gemini 2.5 Flash-Lite: lightweight; suitable for large batch API tasks; lowest unit cost
Gemini’s advantage lies in native multimodality—video, voice, and image integration is better than ChatGPT and Claude, especially YouTube integration (can directly answer by reading YouTube video content). It also has deep native integration with the Google Workspace suite.
Its drawbacks: Traditional Chinese sometimes includes Simplified Chinese terms (inconsistent depending on load), creative writing quality is more mediocre, and readers often report that AI Overview and Gemini’s Traditional Chinese answers are “too short, too conservative.” For Google users in Taiwan, the best positioning is usually “to supplement the multimodal scenarios of ChatGPT/Claude,” rather than being the main model.
Cross-company matchup from real tests: how to choose what fits your scenario best
Cross-company comparisons often fall into a “benchmark war.” In practice, you can infer based on “main task categories”:
Coding (strong) → Claude Opus 4.7 (strict instruction following) or GPT-5.5 (Codex integration is better)
Coding (a lot of it) → Sonnet 4.6 or GPT-5.5 (lower cost, quality is good enough)
Creative writing, copywriting, marketing → GPT-5.5 (more freedom, more variety)
Strictly regulated documents (legal, medical) → Claude Opus 4.7 (high instruction compliance)
Long document analysis (>500K tokens) → Gemini 2.5 Pro (2M context is the longest)
Multimodal (video, voice, images) → Gemini 2.5 Pro or GPT-5.5 (Sora 2 integration)
Batch processing (more than a million times per month) → Haiku 4.5, GPT-5.5-mini, Gemini 2.5 Flash-Lite (depends on which API is already integrated)
Integrate Google Workspace workflows → Gemini 2.5 Pro (deep native integration)
Integrate Microsoft 365 workflows → ChatGPT (Copilot is already built-in)
Need CLI／desktop agent to code → Claude Code (most complete)
Recommendation: start by using either ChatGPT Plus or Claude Pro as your daily main model. When you need long context or multimodality, use Gemini to reinforce it, and route batch tasks directly through the API. All three have monthly fees starting at $20; test it for a month before deciding.
Latest updates as of May 2026
4/16: Claude Opus 4.7 released; 3x visual resolution; SWE-bench 87.6%
4/19: Opus 4.7 new tokenizer has an implied 37–47% token increase
4/24: OpenAI releases GPT-5.5; 1M context; Terminal-Bench 82.7%
4/24: Anthropic’s secondary-market valuation breaks $1 trillion, overtaking OpenAI by $88 billion
5/2: OpenAI publishes GPT-5.5 data from its first week online; API revenue growth rate hits an innovation high
Common questions (FAQ)
Which is the strongest: ChatGPT, Claude, or Gemini?
There’s no absolute answer—depends on the task: strict instruction following and long document analysis → Claude Opus 4.7; creative writing and free generation → GPT-5.5; longest context and Google integration → Gemini 2.5 Pro. All three start at $20/month—test for a month to decide what’s best for you.
How are ChatGPT versions differentiated?
OpenAI’s versions in 2026: GPT-5.5 (main model, ChatGPT Plus default), GPT-5.5 Pro (flagship, exclusive to ChatGPT Pro), GPT-5.5-mini (cheaper API version), GPT-4o (former main model), GPT-4 Turbo (older version). For new projects, just use the 5.5 series.
Which is better for coding: GPT-5.5 or Claude Opus 4.7?
In real tests, it’s a back-and-forth. Claude Opus 4.7 scores 87.6% on SWE-bench and has strong strict instruction adherence; GPT-5.5 scores 82.7% on Terminal-Bench and improved tool-use accuracy for agent tasks. It’s recommended to try both for a month and see which one fits your actual codebase better.
Does Gemini 2.5 Pro really have 2M context?
Yes—it’s the longest among the three. But in real testing with long context, all models show “mid-information loss” (the needle-in-a-haystack problem). Gemini can still retain most information with 1M+ context, but accuracy is worse than with short context. For long document analysis, it’s recommended to break it into multiple queries rather than stuffing everything into one context window.
All three have monthly fees starting at $20—why is there still ChatGPT Pro at $200?
ChatGPT Pro at $200/month unlocks GPT-5.5 Pro (flagship reasoning), unlimited usage, and priority compute resources. It’s worth it for heavy developers and researchers. For general users, $20 ChatGPT Plus is enough. Claude Max ($100/month) follows a similar logic, aimed at heavy users who need higher Opus 4.7 limits.
Should you choose ChatGPT or Claude?
It depends on your work type: coding, strict compliance, long document analysis → Claude; creative writing, integrating Microsoft 365, and needing Sora 2 video → ChatGPT. If you can only choose one, ChatGPT’s ecosystem (Codex, Sora, Operator) is more complete. If you’re coding, Claude Code is currently the strongest CLI／desktop agent.
This full comparison article for 2026: ChatGPT vs Claude vs Gemini—version differences and how to choose—first appeared on Chain News ABMedia.
