Claude Opus 4.8 vs GPT-5.5 (Comparative Analysis)
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Comparative Analysis: Claude Opus 4.8 vs. GPT-5.5
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Overview
GPT-5.5 was released 1 month before Claude Opus 4.8.
 Claude Opus 4.8 |  GPT-5.5 | |
|---|---|---|
Model Provider The organization behind this AI's development | Anthropic | OpenAI |
Input Context Window Maximum input tokens this model can process at once | 1M tokens | 1.1M tokens |
Output Token Limit Maximum output tokens this model can generate at once | 128K tokens | 128K tokens |
Release Date When this model first became publicly available | May 27, 2026 2 months ago May 27th, 2026 | April 24, 2026 3 months ago April 24th, 2026 |
Knowledge Cutoff Latest training-data date reported by the provider | Not reported | December 1, 2025 |
Capabilities & Features
Compare supported features, modalities, and advanced capabilities
Claude Opus 4.8 | GPT-5.5 | |
|---|---|---|
Input Types Supported input formats | 📝Text🖼️Image📁File | 📁File🖼️Image📝Text |
Reasoning Controls Defaults and configurable reasoning effort | OptionalEffort: Max, Extra High, High, Medium, LowDefault: High | Enabled by defaultEffort: Extra High, High, Medium, Low, NoneDefault: Medium |
Output Types Supported output formats | 📝Text | 📝Text |
Tokenizer Text encoding system | Claude | GPT |
Key Features Advanced capabilities | ✓Function Calling✓Structured Output✓Reasoning Mode✓Content Moderation | ✓Function Calling✓Structured Output✓Reasoning Mode✓Content Moderation |
Pricing
Claude Opus 4.8 is roughly 1.0x less expensive compared to GPT-5.5 for input tokens and roughly 0.8x less expensive for output tokens.
| Claude Opus 4.8 | GPT-5.5 | |
|---|---|---|
Short Context Pricing Base rates before a long-context threshold applies | ||
Input Token Cost Cost per million input tokens | $5.00 per million tokens | $5.00 per million tokens |
Output Token Cost Cost per million output tokens | $25.00 per million tokens | $30.00 per million tokens |
Web Search Cost Additional cost for each web search operation | $0.01 per search | $0.01 per search |
Cache Read Cost Cost to reuse cached input tokens | $0.50 per million tokens | $0.50 per million tokens |
Cache Write Cost Cost to write input tokens to the cache | $6.25 per million tokens | Not specified |
1-Hour Cache Write Cost Cost to cache input tokens for one hour | $10.00 per million tokens | Not specified |
Long Context Pricing Rates for prompts with 272,000 or more tokens | ||
Input Token Cost Long-context input cost per million tokens | Not specified | $10.00 per million tokens |
Output Token Cost Long-context output cost per million tokens | Not specified | $45.00 per million tokens |
Cache Read Cost Long-context cache read cost per million tokens | Not specified | $1.00 per million tokens |
Benchmarks
Compare relevant benchmarks between Claude Opus 4.8 and GPT-5.5.
| Claude Opus 4.8 | GPT-5.5 | |
|---|---|---|
Intelligence Index Overall model quality across independent evaluations | 55.7 (Artificial Analysis index; higher is better) | 54.8 (Artificial Analysis index; higher is better) |
Coding Index Programming performance across independent evaluations | 74.3 (Artificial Analysis index; higher is better) | 74.9 (Artificial Analysis index; higher is better) |
Agentic Index Ability to complete multi-step agentic tasks | 47.2 (Artificial Analysis index; higher is better) | 44.9 (Artificial Analysis index; higher is better) |
Best Design Arena Score Highest human-preference Elo score across design arenas | 1,341 Elo (#1 in Androidnative (67.2% win rate)) | 1,344 Elo (#4 in Game Dev (62.2% win rate)) |
At a Glance
Quick overview of what makes Claude Opus 4.8 and GPT-5.5 unique.
Claude Opus 4.8 by Anthropic understands both text and images, can use external tools and APIs, offers advanced reasoning, generates structured data. It can handle standard conversations with its 1M token context window. Premium pricing at $5.00/M input and $25.00/M output tokens. Includes built-in content moderation for safer outputs. Released May 27th, 2026.GPT-5.5 by OpenAI understands both text and images, can use external tools and APIs, offers advanced reasoning, generates structured data. It can handle standard conversations with its 1.1M token context window. Premium pricing at $5.00/M input and $30.00/M output tokens. Includes built-in content moderation for safer outputs. Released April 24th, 2026.Explore More Comparisons
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Compare GPT-5.5 with:
🚀Programming
Best models for coding and development
🎨Creative & Roleplay
Models optimized for creative writing
📢Marketing
Content creation and marketing tasks
💻Technology
Technical analysis and explanations
🔬Science
Scientific research and analysis
🌐Translation
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