gpt-5.3-codex vs claude-sonnet-4-5-20250929 API price comparison

Compare gpt-5.3-codex vs claude-sonnet-4-5-20250929 cheapest routes, input/output prices, shared platforms, cache coverage, and crawl freshness.

Latest crawl: Sep 6, 2026 路 shared platforms: 8

Price verdict

claude-sonnet-4-5-20250929 is about 19% cheaper than gpt-5.3-codex on the cheapest listed combined route, making it the first cost-sensitive option to inspect.

gpt-5.3-codex cheapest

0.81 USD/M tokens

Micu

claude-sonnet-4-5-20250929 cheapest

0.66 USD/M tokens

Xcode Best

Platform coverage

11/12

Listed platform count for each model.

Cache coverage

82%/83%

Share of routes that publish cache read or write prices.

Model snapshots

  • gpt-5.3-codex

    OpenAI 路 coding

    Cheapest combined route: Micu at 0.81 USD/M tokens.

    Lowest input: 0.09 USD/M tokens 路 lowest output: 0.72 USD/M tokens

  • claude-sonnet-4-5-20250929

    Anthropic 路 chat

    Cheapest combined route: Xcode Best at 0.66 USD/M tokens.

    Lowest input: 0.11 USD/M tokens 路 lowest output: 0.55 USD/M tokens

Shared platform comparison

Platformgpt-5.3-codexclaude-sonnet-4-5-20250929Lower route
Micu 0.81 USD/M tokens 1.20 USD/M tokens gpt-5.3-codex
AICoding 3.42 USD/M tokens 3.42 USD/M tokens gpt-5.3-codex
Yunwu 9.45 USD/M tokens 18.00 USD/M tokens gpt-5.3-codex
Qianduoduo 15.75 USD/M tokens 14.40 USD/M tokens claude-sonnet-4-5-20250929
Atlas Cloud 15.75 USD/M tokens 18.00 USD/M tokens gpt-5.3-codex
Neko 15.75 USD/M tokens 18.00 USD/M tokens gpt-5.3-codex
DMXAPI 39.09 USD/M tokens 18.00 USD/M tokens claude-sonnet-4-5-20250929
PackyCode 78.75 USD/M tokens 36.00 USD/M tokens claude-sonnet-4-5-20250929

Continue comparing

gpt-5.3-codex 路 claude-sonnet-4-5-20250929 路 ratio ranking