OpenAI: GPT-5.5 Pro alternatives
Ranked by capability overlap, similar context window, and similar price tier. Cross-vendor options are weighted higher than same-provider alternatives.
See also: OpenAI: GPT-5.5 Pro model details · GPT-5 family · OpenAI provider page
Top 15 alternatives
| # | Model | Provider | Why | Context | Input price / 1M | Compare |
|---|---|---|---|---|---|---|
| 1 | Anthropic: Claude Opus 4.7 (Fast) | Anthropic | shares reasoning, tool-use, structured-output, vision · similar price tier | 1M Ultra context (1M+) | $30.00 Premium | vs → |
| 2 | Anthropic: Claude Fable 5 | Anthropic | shares reasoning, tool-use, structured-output, vision · similar context window | 1M Ultra context (1M+) | $10.00 Premium | vs → |
| 3 | Anthropic: Claude Opus 4.6 | Anthropic | shares reasoning, tool-use, structured-output, vision · similar context window | 1M Ultra context (1M+) | $5.00 Standard | vs → |
| 4 | Anthropic: Claude Opus 4.7 | Anthropic | shares reasoning, tool-use, structured-output, vision · similar context window | 1M Ultra context (1M+) | $5.00 Standard | vs → |
| 5 | Anthropic: Claude Opus 4.8 | Anthropic | shares reasoning, tool-use, structured-output, vision · similar context window | 1M Ultra context (1M+) | $5.00 Standard | vs → |
| 6 | Anthropic: Claude Opus 4.8 (Fast) | Anthropic | shares reasoning, tool-use, structured-output, vision · similar context window | 1M Ultra context (1M+) | $10.00 Premium | vs → |
| 7 | Anthropic: Claude Sonnet 4.5 | Anthropic | shares reasoning, tool-use, structured-output, vision · similar context window | 1M Ultra context (1M+) | $3.00 Standard | vs → |
| 8 | Anthropic: Claude Sonnet 4.6 | Anthropic | shares reasoning, tool-use, structured-output, vision · similar context window | 1M Ultra context (1M+) | $3.00 Standard | vs → |
| 9 | Anthropic: Claude Sonnet 5 | Anthropic | shares reasoning, tool-use, structured-output, vision · similar context window | 1M Ultra context (1M+) | $2.00 Standard | vs → |
| 10 | Claude Opus 5 | Anthropic | shares reasoning, tool-use, structured-output, vision · similar context window | 1M Ultra context (1M+) | $5.00 Standard | vs → |
| 11 | Claude Opus 5 (Fast) | Anthropic | shares reasoning, tool-use, structured-output, vision · similar context window | 1M Ultra context (1M+) | $10.00 Premium | vs → |
| 12 | Google: Gemini 2.5 Flash | shares reasoning, tool-use, structured-output, vision · similar context window | 1.0M Ultra context (1M+) | $0.30 Budget | vs → | |
| 13 | Google: Gemini 2.5 Flash Lite | shares reasoning, tool-use, structured-output, vision · similar context window | 1.0M Ultra context (1M+) | $0.10 Budget | vs → | |
| 14 | Google: Gemini 2.5 Flash Lite Preview 09-2025 | shares reasoning, tool-use, structured-output, vision · similar context window | 1.0M Ultra context (1M+) | $0.10 Budget | vs → | |
| 15 | Google: Gemini 2.5 Pro | shares reasoning, tool-use, structured-output, vision · similar context window | 1.0M Ultra context (1M+) | $1.25 Standard | vs → |