Claude 1vsGPT-5.3-Codex-Spark
Claude 1 | GPT-5.3-Codex-Spark | |
|---|---|---|
| Specifications | ||
Context windowHow much text the model can hold in mind at once — your question, any documents you attach, the conversation so far, and its own reply. Go past it and the earliest part falls out of view. | 9k | 128k |
| Overview | ||
| Company | Anthropic | OpenAI |
| Release date | Mar 14 2023 | Feb 12 2026 |
| Access | Proprietary | Proprietary |
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Frequently asked questions
Claude 1 and GPT-5.3-Codex-Spark don't publish scores on any of the same benchmarks, so there's no direct head-to-head comparison. Claude 1 shipped 1066 days before GPT-5.3-Codex-Spark, so benchmark comparisons should account for the intervening progress.
Context windows are 9k (Claude 1) vs 128k (GPT-5.3-Codex-Spark).
Direct benchmark comparisons are unavailable — Claude 1 and GPT-5.3-Codex-Spark don't publish scores on any of the same benchmarks.
Claude 1 was released by Anthropic on Mar 14 2023.
GPT-5.3-Codex-Spark was released by OpenAI on Feb 12 2026.
Claude 1 has a 9k context window; GPT-5.3-Codex-Spark has 128k.