Anthropic: Claude 3.5 Sonnet vs OpenAI: GPT-5.3-Codex
Side-by-side comparison of Anthropic: Claude 3.5 Sonnet and OpenAI: GPT-5.3-Codex. Compare pricing, context window, capabilities, and find out which is better for your workflow.
Verdict
strong confidenceOpenAI: GPT-5.3-Codex leads overall
OpenAI: GPT-5.3-Codex leads in price and context window and capabilities and max output, making it the stronger choice for most workflows. Anthropic: Claude 3.5 Sonnet remains a solid alternative depending on your specific needs.
Best for with Anthropic: Claude 3.5 Sonnet
Best for with OpenAI: GPT-5.3-Codex
Side-by-side
Technical specifications
| Anthropic: Claude 3.5 Sonnet | OpenAI: GPT-5.3-Codex | |
|---|---|---|
| Provider | Anthropic | OpenAI |
| Input price | $6/M | $2/M |
| Output price | $30/M | $14/M |
| Context window | 200K | 400K |
| Max output | 8K | 128K |
| Capabilities | Tool useVision | Tool useVisionReasoning |
| Released | Oct 21, 2024 | Feb 24, 2026 |
Scoring breakdown
How each dimension compares
Price
OpenAI: GPT-5.3-Codex leadsAnthropic: Claude 3.5 Sonnet
$30/M tokens
OpenAI: GPT-5.3-Codex
$14/M tokens
Context Window
OpenAI: GPT-5.3-Codex leadsAnthropic: Claude 3.5 Sonnet
200K tokens
OpenAI: GPT-5.3-Codex
400K tokens
Capabilities
OpenAI: GPT-5.3-Codex leadsAnthropic: Claude 3.5 Sonnet
2/4
OpenAI: GPT-5.3-Codex
3/4
Max Output
OpenAI: GPT-5.3-Codex leadsAnthropic: Claude 3.5 Sonnet
8K tokens
OpenAI: GPT-5.3-Codex
128K tokens
Recency
Anthropic: Claude 3.5 Sonnet
Oct 2024
OpenAI: GPT-5.3-Codex
Feb 2026
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