Compare AI models
| 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. | 200k | 128k |
| Overview | ||
| Company | Anthropic | OpenAI |
| Release date | Nov 21 2023 | Feb 12 2026 |
| Access | Closed | Closed |
| Model details | View model | View model |
Other comparisons
Claude 2.1vsGemini 4 ArgonGPT-5.3-Codex-SparkvsGemini 4 ArgonClaude 2.1vsMuse WonderGPT-5.3-Codex-SparkvsMuse WonderClaude 2.1vsGrok 4.7GPT-5.3-Codex-SparkvsGrok 4.7Claude 2.1vsDeepSeek-V4.1-FlashGPT-5.3-Codex-SparkvsDeepSeek-V4.1-FlashClaude 2.1vsMistral Large 4GPT-5.3-Codex-SparkvsMistral Large 4Claude 2.1vsKimi K3GPT-5.3-Codex-SparkvsKimi K3Frequently asked questions
Claude 2.1 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 2.1 shipped 814 days before GPT-5.3-Codex-Spark, so benchmark comparisons should account for the intervening progress.
Context windows are 200k (Claude 2.1) vs 128k (GPT-5.3-Codex-Spark).
Direct benchmark comparisons are unavailable — Claude 2.1 and GPT-5.3-Codex-Spark don't publish scores on any of the same benchmarks.