One agent session
1M input tokens and 100K output tokens, no caching.
- Input1M x $5 = $5.00
- Output0.1M x $30 = $3.00
$8.00per session
OpenAI - Closed weights
Chat Latest pricing and specs
Chat Latest is a closed-weights model from OpenAI that costs $5 per 1M input tokens and $30 per 1M output tokens on the first-party API, with a 400K-token context window.
Last verified from developers.openai.com. All sources
- Input / 1M
- $5
- Output / 1M
- $30
- Context
- 400K tokens
- Weights
- Closed
Pricing per 1M tokens
| Item | Price / 1M tokens |
|---|---|
| Input | $5 |
| Output | $30 |
| Cache read | $0.50 |
Note: Moving alias for the latest Instant model used in ChatGPT; OpenAI recommends the GPT-6 family for production. The underlying snapshot is updated regularly (latest update 2026-10-07; alias first released 2026-05-05), so The release date is left blank. Listed under Specialized models with no Batch price. Maximum input tokens 272,000. Not found in the Vercel AI Gateway model list.
Specs
- Context window
- 400,000 tokens
- Max output
- 128,000 tokens
- Provider
- OpenAI
- API model id
chat-latest- Weights
- Closed weights
What Chat Latest costs in practice
Worked from the standard list rates above, with the math shown so you can swap in your own token counts.
A chat app
10,000 requests a day at 2K input and 500 output tokens each.
- Input20M x $5 = $100.00
- Output5M x $30 = $150.00
$250.00per day
$7,500.00 per 30-day month
The same session at a 90% cache hit
90% of the input is read from the prompt cache. The one-time cache write premium is not included.
- Cached input0.9M x $0.50 = $0.45
- Uncached input0.1M x $5 = $0.50
- Output0.1M x $30 = $3.00
$3.95per session
Compare with
| Model | Input / 1M | Output / 1M |
|---|---|---|
| Chat Latest (this page) | $5 | $30 |
| GPT-4 TurboOpenAI | $10 | $30 |
| GPT-5.5OpenAI | $5 | $30 |
| Claude Opus 4.5Anthropic | $5 | $25 |
| Claude Opus 4.6Anthropic | $5 | $25 |
| GPT-5.6 SolOpenAI | $4 | $20 |
| GPT-5.4OpenAI | $2.50 | $15 |
| GPT-5.2OpenAI | $1.75 | $14 |
| GPT-5.3-CodexOpenAI | $1.75 | $14 |
Related reading
- Codex CLI 0.163: Instant Steering Is Now the DefaultCodex CLI 0.163.0 makes mid-response steering the default and adds searchable /config and a leader key. What changed and what to check before upgrading.
- Tool Calling Under the Hood: Claude Messages vs OpenAI ResponsesHow tool calling works on the wire: JSON schema tools, parallel calls, tool_choice, strict mode and streaming deltas in Claude Messages vs OpenAI Responses.
- Codex 'gpt-5.5 Model Is Not Supported' Error: The FixCodex says gpt-5.5 is not supported with a ChatGPT account because OpenAI retired it from ChatGPT sign-in on October 14. The fix and what still works.
- Codex CLI Background Daemon: How to Turn It OffCodex CLI starts a persistent, self-updating background daemon since 0.157.0. What it does, why it hit Hacker News and the reported workaround to turn it off.
- Codex CLI 0.162: Managed Worktrees and Pinned TasksCodex CLI 0.162 lets the agent create and list its own Git worktrees, adds pinned tasks and custom provider capability overrides. What to change this week.
- ChatGPT Free vs Go vs Plus After GPT-6: Which Model You GetFree and Go ($8) both get GPT-6 Luna in Chat. Plus ($20) is the cheapest plan with GPT-6 Sol and full Codex. What each ChatGPT plan buys now.
FAQ
How much does Chat Latest cost per million tokens?
Chat Latest costs $5 per 1M input tokens and $30 per 1M output tokens on OpenAI's first-party API, per developers.openai.com on October 17, 2026. Per 1M tokens, cache reads cost $0.50.
What is Chat Latest's context window?
Chat Latest has a 400,000-token context window and returns up to 128,000 output tokens per response.
Are Chat Latest's weights open?
No. Chat Latest is a closed-weights model. You call it through OpenAI's API as chat-latest.
Sources
Last verified from developers.openai.com.
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