Anthropic: Claude Opus 4.6 vs OpenAI: GPT-5.1-Codex-Max
Side-by-side comparison of Anthropic: Claude Opus 4.6 and OpenAI: GPT-5.1-Codex-Max. Compare pricing, context window, capabilities, and find out which is better for your workflow.
Verdict
moderate confidenceAnthropic: Claude Opus 4.6 and OpenAI: GPT-5.1-Codex-Max are closely matched across pricing, context, and capabilities. Your choice depends on workflow-specific factors like provider ecosystem preference and existing integrations.
Best for with Anthropic: Claude Opus 4.6
Best for with OpenAI: GPT-5.1-Codex-Max
Side-by-side
Technical specifications
| Anthropic: Claude Opus 4.6 | OpenAI: GPT-5.1-Codex-Max | |
|---|---|---|
| Provider | Anthropic | OpenAI |
| Input price | $5/M | $1/M |
| Output price | $25/M | $10/M |
| Context window | 1.0M | 400K |
| Max output | 128K | 128K |
| Capabilities | Tool useVisionReasoning | Tool useVisionReasoning |
| Released | Feb 4, 2026 | Dec 4, 2025 |
Scoring breakdown
How each dimension compares
Price
OpenAI: GPT-5.1-Codex-Max leadsAnthropic: Claude Opus 4.6
$25/M tokens
OpenAI: GPT-5.1-Codex-Max
$10/M tokens
Context Window
Anthropic: Claude Opus 4.6 leadsAnthropic: Claude Opus 4.6
1.0M tokens
OpenAI: GPT-5.1-Codex-Max
400K tokens
Capabilities
Anthropic: Claude Opus 4.6
3/4
OpenAI: GPT-5.1-Codex-Max
3/4
Max Output
Anthropic: Claude Opus 4.6
128K tokens
OpenAI: GPT-5.1-Codex-Max
128K tokens
Recency
Anthropic: Claude Opus 4.6
Feb 2026
OpenAI: GPT-5.1-Codex-Max
Dec 2025
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