openai gpt-5.1-codex-max
openai gpt-5.1-codex-max costs USD 1.25 per 1M input tokens and USD 10.00 per 1M output tokens (community cross-check, https://github.com/BerriAI/litellm/blob/main/model_prices_and_context_window.json), verified 2026-10-24 17:01 UTC.
Last verified 2026-10-24T17:01:34+00:00 · Source: https://github.com/BerriAI/litellm/blob/main/model_prices_and_context_window.json (community cross-check, waak source litellm)
A first-party listing of this model exists and is shown below; this row is the community cross-check.
Price
- Input
- USD 1.25 / 1M tokens
- Output
- USD 10.00 / 1M tokens
- Cached input
- USD 0.125 / 1M
- This price since
- 2025-12-07T00:09:27+00:00
- FX used
- 1 EUR = 1.1367 USD (ECB)
- Billing
- per_token
Specification
- Context window (tokens)
- 400,000
- Max output
- 128,000
- Mode
- responses
- Region
- global
- Listing
- listing not verifiable
aggregator / community mirror: no first-party public page to check against - First seen
- 2025-12-07T00:09:27+00:00
- SKU id
llm/openai/gpt-5.1-codex-max
Other listings of this model
Sources can disagree. The provider's own listing is first-party; LiteLLM, OpenRouter and models.dev are community cross-checks. Differences are shown, not resolved.
| SKU | Source | Input / 1M | Output / 1M | vs this page | Last verified |
|---|---|---|---|---|---|
| llm/azure/gpt-5.1-codex-max | azure-retail-openai (first-party) | 1.25 | 10.00 | agrees | 2026-10-24T12:29:35+00:00 |
| llm/modelsdev/abacus/gpt-5.1-codex-max | modelsdev (community cross-check) | 1.25 | 10.00 | agrees | 2026-10-24T17:47:11+00:00 |
| llm/modelsdev/aimlapi/openai/gpt-5.1-codex-max | modelsdev (community cross-check) | 2.645 | 21.16 | differs differs by +111.6% | 2026-10-24T17:47:11+00:00 |
| llm/modelsdev/azure-cognitive-services/gpt-5.1-codex-max | modelsdev (community cross-check) | 1.25 | 10.00 | agrees | 2026-10-24T17:47:11+00:00 |
| llm/modelsdev/azure/gpt-5.1-codex-max | modelsdev (community cross-check) | 1.25 | 10.00 | agrees | 2026-10-24T17:47:11+00:00 |
| llm/modelsdev/edenai/azure/gpt-5.1-codex-max | modelsdev (community cross-check) | 1.25 | 10.00 | agrees | 2026-10-24T17:47:11+00:00 |
| llm/modelsdev/jiekou/gpt-5.1-codex-max | modelsdev (community cross-check) | 1.1875 | 9.50 | differs differs by -5.0% | 2026-10-24T17:47:11+00:00 |
| llm/modelsdev/kilo/openai/gpt-5.1-codex-max | modelsdev (community cross-check) | 1.25 | 10.00 | agrees | 2026-10-24T17:47:11+00:00 |
| llm/modelsdev/nano-gpt/openai/gpt-5.1-codex-max | modelsdev (community cross-check) | 2.50 | 20.00 | differs differs by +100.0% | 2026-10-24T17:47:11+00:00 |
| llm/modelsdev/ofox/openai/gpt-5.1-codex-max | modelsdev (community cross-check) | 1.25 | 10.00 | agrees | 2026-10-24T17:47:11+00:00 |
| llm/modelsdev/opencode/gpt-5.1-codex-max | modelsdev (community cross-check) | 1.25 | 10.00 | agrees | 2026-10-24T17:47:11+00:00 |
| llm/modelsdev/openrouter/openai/gpt-5.1-codex-max | modelsdev (community cross-check) | 1.25 | 10.00 | agrees | 2026-10-24T17:47:11+00:00 |
Price history (90 days)
| Observed (UTC) | Price | USD | EUR | Output / 1M | Snapshot |
|---|---|---|---|---|---|
| 2026-09-24T23:42:39+00:00 | USD 1.25 | 1.25 | 1.0997 | 10.00 | #312 |
| 2025-12-07T00:09:27+00:00 | USD 1.25 | 1.25 | 1.0734 | 10.00 | #181 |
Each row is a change point: the price held from that moment until the next row. Full history: JSON · CSV.
Changes
| Seen | Kind | Change |
|---|---|---|
| 2026-09-24T23:42:39+00:00 between 2026-09-23 and 2026-09-24 |
Relisted | 1.25 USD |
| 2026-09-22T22:14:48+00:00 between 2026-09-21 and 2026-09-22 |
Delisted | was 1.25 USD |
| 2026-01-16T23:18:46+00:00 between 2026-01-10 and 2026-01-16 |
Spec change Context window (tokens) | 400000.0 → 272000.0 |
| 2025-12-07T00:09:27+00:00 between 2025-11-28 and 2025-12-07 |
New SKU | 1.25 USD |
API: /v1/skus/llm/openai/gpt-5.1-codex-max
Cite this
Free to reuse under CC BY 4.0 with this credit. The numbers are list prices, not transacted prices.
InfraRabbit (2026). openai gpt-5.1-codex-max [data as of 2026-10-24]. https://infrarabbit.com/llm/openai/gpt-5.1-codex-max (accessed 2026-10-24). List prices, not transacted prices. CC BY 4.0.
BibTeX
@misc{infrarabbit_llm_openai_gpt_5_1_codex_max_2026,
author = {{InfraRabbit}},
title = {openai gpt-5.1-codex-max},
year = {2026},
howpublished = {\url{https://infrarabbit.com/llm/openai/gpt-5.1-codex-max}},
note = {Data as of 2026-10-24; accessed 2026-10-24; list prices, not transacted prices; CC BY 4.0}
}