Expired50% confidenceFactExact time
258k is the effective context ceiling actually available in Codex, approximately 95% of 272k, and upon reaching this point the system automatically triggers local or remote compression.
1
Sources
50%
Confidence
Medium-term (~90 days)
Relevance
7/19/2026
First Seen
Valid until: 10/17/2026(expired)
Sources
Related Claims
UnverifiedThe standard Bluetooth SBC codec has an upper bit rate limit of approximately 328 kbps.68% similarVerified以LLaMA-3 70B（80层、64头、每头128维）为例，单个token的KV Cache约占2.6MB（FP16精度），32K上下文的KV Cache总量约达83GB65% similarUnverifiedOn the RTX 5090, the Qwen3.6 27B model's prefill speed increases from 174 to 253 tokens/s, with a VRAM usage of approximately 18 GB.64% similarUnverifiedOn the RTX 5090, the Qwen3.6 35B-A3B achieves an inference speed of 220 tokens/s with approximately 23 GB of VRAM usage.63% similarUnverifiedHunyuan V3 has a context window of 256K and a maximum output of approximately 8K.63% similar
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