GPT-5.1 Codex
opencode The API that serves this model and sets the prices shown here. gpt-5.1-codex The model identifier to send in API requests. LLM Generates text from a prompt, so it can be compared with other LLMs on price and capability. Large The most capable general-purpose tier of a model family. Retired Jul 23, 2026 This model has been retired and can no longer be relied on.Provider: openai · served via OpenCode
Knowledge cutoff: September 2024
Deprecated on OpenCode Zen; scheduled retirement announced.
Sticker prices & cost-per-token
List rates as published by OpenCode, before any volume or enterprise discounts.
$1.07
$8.50
400,000 tokens
128,000
tokens per response (includes reasoning tokens)
Closed weights
$0.107
Get this data free
Want to stay updated on price changes on this model? Pull this data free (no API key required) here:
curl "https://coolhandlabs.com/api/v2/inference_apis?q%5Bmodel_eq%5D=gpt-5.1-codex&q%5Bsource_api_eq%5D=opencode"Pricing History
| Effective | Price |
|---|---|
| Aug 12, 2026 – present | Input cost: $1.07 / 1M, Output cost: $8.50 / 1M, Cached input cost: $0.107 / 1M, Cache creation cost: $0.00 / 1M, 5-minute cache write cost: $0.00 / 1M, 1-hour cache write cost: $0.00 / 1M, Reasoning output cost: $0.00 / 1M, Cache storage cost: $0.00 / 1M/hr |
History
Last change detected October 5, 2026 (21 days ago) by an automated scan.
| Date | Changed by | What changed |
|---|---|---|
| Aug 12, 2026 | Unknown | Initial record created |
Source
https://opencode.ai/docs/zen/ (via https://models.dev/api.json)Comparable models
No comparable models identified yet.
Reliability
No reliability incidents recorded in the last 90 days.
Frequently asked questions
GPT-5.1 Codex (openai via OpenCode) costs $1.07 per 1M input tokens and $8.50 per 1M output tokens, as last published by OpenCode.
GPT-5.1 Codex has a context window of 400,000 tokens (the maximum combined input and output it can handle in a single request).
GPT-5.1 Codex sits in the large size tier. Size tiers run from micro (small enough to run on a device) through small, medium and large to extra large (frontier flagships), and are assigned from the model's family, naming and limits rather than its price.
GPT-5.1 Codex can generate up to 128,000 tokens in a single response. Reasoning (thinking) tokens count toward this limit.
GPT-5.1 Codex's training data runs through September 2024, so it may not know about later events. Coolhand records the cutoff at month precision, since providers often publish only the month.
GPT-5.1 Codex accepts image and text as input and produces text as output, as recorded in the Coolhand catalog.
No — the weights of GPT-5.1 Codex have not been released, so it is only available through hosted APIs.
Yes — openai deprecated GPT-5.1 Codex on July 23, 2026. Deprecated on OpenCode Zen; scheduled retirement announced.
openai retired GPT-5.1 Codex on July 23, 2026.
Since GPT-5.1 Codex is deprecated, openai customers are moving to GPT-4, GPT-Image-2, and o1 Mini.
Call GET https://coolhandlabs.com/api/v2/inference_apis?q[source_api_eq]=opencode&q[model_eq]=gpt-5.1-codex — free, no API key required, and scoped to just this model since source_api and model together are unique. See https://coolhandlabs.com/docs for the full REST API reference.
Coolhand also tracks GPT-4, GPT-3.5 Turbo 0125, GPT-3.5 Turbo 1106, GPT-3.5 Turbo Instruct, GPT-4 Turbo Vision, and GPT-4 from openai. Some may already be deprecated, so check each model's status alongside its current pricing.
| Model | Input cost | Output cost | Context window | Max output tokens | Status |
|---|---|---|---|---|---|
| GPT-4 | $30.00/1M $0.0000300000 | $60.00/1M $0.0000600000 | 8,192 | 8,192 |
Deprecated Oct 23, 2026
|
| GPT-3.5 Turbo 0125 via Azure | $0.50/1M $0.0000005000 | $1.50/1M $0.0000015000 | 16,384 | 16,384 |
Deprecated Aug 13, 2026
|
| GPT-3.5 Turbo 1106 via Azure | $1.00/1M $0.0000010000 | $2.00/1M $0.0000020000 | 16,384 | 16,384 |
Deprecated Aug 13, 2026
|
| GPT-3.5 Turbo Instruct via Azure | $1.50/1M $0.0000015000 | $2.00/1M $0.0000020000 | 4,096 | 4,096 |
Deprecated Aug 13, 2026
|
| GPT-4 Turbo Vision via Azure | $10.00/1M $0.0000100000 | $30.00/1M $0.0000300000 | 128,000 | 4,096 |
Deprecated Aug 13, 2026
|
| GPT-4 via Azure | $30.00/1M $0.0000300000 | $60.00/1M $0.0000600000 | — | — | Active |
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