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GPT 5.3 Codex (Fast)

openai·openai/gpt-5.3-codex-fast·GA·Closed·gpt-codex series
Coding-optimized GPT model for repository edits, reviews, and agentic software work

Specs & pricing

Input / output per 1M tokens
Reference price·Vercel AI Gateway
$3.50 / $28.00
Blended $9.63 · Cache read $0.35
Lowest paid·Vercel AI GatewayCloud
$3.50 / $28.00
Blended $9.63
Context
400,000
Output limit
128,000
Knowledge cutoff
2025-08-31
Released / updated
2026-02-05 / 2026-02-05
Capabilities
✓ Reasoning✓ Tool use✓ Structured output✓ Temperature✓ Attachments
Modalities
TextImagePDF

Available at 1 providers1 with public prices

ProviderTierInputOutputCache readCache writeContextOutput limitStatus
Vercel AI GatewayCloud$3.50$28.00$0.35—400,000128,000

Sorted by blended price (input×0.75 + output×0.25) asc. The official channel always shows regardless of rank. Whether a gateway's low price is actually usable can't be verified.

Reasoning control

effort = noneeffort = minimaleffort = loweffort = mediumeffort = higheffort = xhigh

Your usage cost

1Vercel AI Gateway$1,722.00
The cheapest paid channel is the only channel.

Price historyone sample accumulated per data sync

Input list $3.50Output list $28.00Min blended $9.63

Price history accumulates from each data sync; currently only 1 sample(s) (2026-08-19). Each future sync adds a point, and once accumulated a line is drawn here.

Related models

GPT-5.3 Codexsame series$1.75 / $14.00Agentic Chat (GPT-5.3 Codex)same series$0 / $0OpenAI GPT-5.3 Codexsame series$1.75 / $14.00GLM-5.2cheaper alternative$1.40 / $4.40GLM-5.3cheaper alternative$1.40 / $4.40GLM-5.3-Flashcheaper alternative$0.15 / $0.50DeepSeek V4.1 Flashcheaper alternative$0.15 / $0.60
Data partly from models.dev (MIT) · Vercel AI Gateway official docs ↗