GPT-5.3 Codex vs Claude Sonnet 5
2026 Stored listed rates & illustrative token-cost comparison
GPT-5.3 Codex
Deprecated
Deprecated endpoints may still be callable. Migrate before retirement. Retirement: 2027-04-01
Replacement reference: gpt-6-solClaude Sonnet 5
Legacy / Superseded
Legacy / superseded version. Newer models are available; official or partner channels may still serve this version.
Illustrative Listed-Rate Difference
Claude Sonnet 5 about 12% lower
1M input + 200K output tokens; not a monthly bill
📌 Executive Summary (TL;DR):Under a standard baseline of 1M input + 200K output tokens, Claude Sonnet 5 lists approximately 12% lower than GPT-5.3 Codex. For high-throughput production workloads, Claude Sonnet 5 delivers superior unit economics; model your specific monthly workload below before migrating.
💡 10M Monthly Token Workload Simulation
Simulating a production workload (10M input + 2M output tokens): GPT-5.3 Codex listed rate totals ~$45.50, while Claude Sonnet 5 totals ~$40.00. Switching to Claude Sonnet 5 yields ~$5.50/mo in raw token savings.
Metric
GPT-5.3 Codex (OpenAI)
Claude Sonnet 5 (Anthropic)
Input listed rate
$1.75 / 1M Tokens
$2.00 / 1M Tokens
Output listed rate
$14.00 / 1M Tokens
$10.00 / 1M Tokens
Cached Input rate
$0.18 / 1M Tokens
$0.20 / 1M Tokens
Context Window
400K Tokens
1000K Tokens
Modality
llm
llm
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