Expired85% confidenceFactTime unknown
GPT-5.4's Codex has added a Fast mode, which increases speed by 1.5x but consumes double the quota.
1
Sources
85%
Confidence
Medium-term (~90 days)
Relevance
6/1/2026
First Seen
Valid until: 8/30/2026(expired)
Sources
Related Entities
Related Claims
UnverifiedGPT-4o achieves approximately a 2x improvement in inference speed compared to GPT-4 Turbo.77% similarUnverifiedGPT-5.6 introduced an 'UltraFast' mode with inference speed improved by 2 to 3 times76% similarUnverifiedOpus 4.5 in High mode responds significantly faster than GPT-5.2 Codex and supports deep integration with the IDE environment via a VS Code plugin.75% similarUnverifiedGPT-5.2 Codex has an extremely slow response speed at its highest thinking level, which is its biggest current weakness.75% similarUnverifiedGPT-5.2's final optimized score was 1,243 cycles, achieving a 119x speedup ratio, approximately 16.4% lower than Claude Opus 4.5's baseline of 1,487 cycles.74% similar
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