Anthropic: Claude Sonnet 4.6 vs OpenAI: GPT-5.3 Chat
Side-by-side comparison of Anthropic: Claude Sonnet 4.6 and OpenAI: GPT-5.3 Chat. Compare pricing, context window, capabilities, and find out which is better for your workflow.
Verdict
strong confidenceAnthropic: Claude Sonnet 4.6 leads overall
Anthropic: Claude Sonnet 4.6 leads clearly, winning on 3 of 5 dimensions. Choose Anthropic: Claude Sonnet 4.6 unless your workflow specifically requires OpenAI: GPT-5.3 Chat's advantages.
Best for with Anthropic: Claude Sonnet 4.6
Best for with OpenAI: GPT-5.3 Chat
Side-by-side
Technical specifications
| Anthropic: Claude Sonnet 4.6 | OpenAI: GPT-5.3 Chat | |
|---|---|---|
| Provider | Anthropic | OpenAI |
| Input price | $3/M | $2/M |
| Output price | $15/M | $14/M |
| Context window | 1.0M | 128K |
| Max output | 128K | 16K |
| Capabilities | Tool useVisionReasoning | Tool useVision |
| Released | Feb 17, 2026 | Mar 3, 2026 |
Scoring breakdown
How each dimension compares
Price
OpenAI: GPT-5.3 Chat leadsAnthropic: Claude Sonnet 4.6
$3/M in / $15/M out
OpenAI: GPT-5.3 Chat
$2/M in / $14/M out
Context Window
Anthropic: Claude Sonnet 4.6 leadsAnthropic: Claude Sonnet 4.6
1.0M
OpenAI: GPT-5.3 Chat
128K
Capabilities
Anthropic: Claude Sonnet 4.6 leadsAnthropic: Claude Sonnet 4.6
3/4 features
OpenAI: GPT-5.3 Chat
2/4 features
Max Output
Anthropic: Claude Sonnet 4.6 leadsAnthropic: Claude Sonnet 4.6
128K
OpenAI: GPT-5.3 Chat
16K
Release Date
OpenAI: GPT-5.3 Chat leadsAnthropic: Claude Sonnet 4.6
Feb 17, 2026
OpenAI: GPT-5.3 Chat
Mar 3, 2026
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