modelsdev GPT-5.1-Codex-Max (aimlapi/openai/gpt-5.1-codex-max)
modelsdev GPT-5.1-Codex-Max costs USD 2.645 per 1M input tokens and USD 21.16 per 1M output tokens (community cross-check, https://models.dev/), verified 2026-10-24 05:42 UTC.
Last verified 2026-10-24T05:42:41+00:00 · Source: https://models.dev/ (community cross-check, waak source modelsdev)
A first-party listing of this model exists and is shown below; this row is the community cross-check.
Price
- Input
- USD 2.645 / 1M tokens
- Output
- USD 21.16 / 1M tokens
- Cached input
- USD 0.2645 / 1M
- This price since
- 2026-10-22T17:15:23+00:00
- FX used
- 1 EUR = 1.1234 USD (ECB)
- Billing
- per_token
Specification
- Context window (tokens)
- 400,000
- Max output
- 128,000
- Open weights
- no
- Reasoning
- yes
- Source kind
- community
- Vendor
- aimlapi
- Region
- global
- Listing
- listing not verifiable
aggregator / community mirror: no first-party public page to check against - First seen
- 2026-10-19T22:42:32+00:00
- SKU id
llm/modelsdev/aimlapi/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 | differs differs by -52.7% | 2026-10-23T12:28:14+00:00 |
| llm/modelsdev/abacus/gpt-5.1-codex-max | modelsdev (community cross-check) | 1.25 | 10.00 | differs differs by -52.7% | 2026-10-24T05:42:41+00:00 |
| llm/modelsdev/azure-cognitive-services/gpt-5.1-codex-max | modelsdev (community cross-check) | 1.25 | 10.00 | differs differs by -52.7% | 2026-10-24T05:42:41+00:00 |
| llm/modelsdev/azure/gpt-5.1-codex-max | modelsdev (community cross-check) | 1.25 | 10.00 | differs differs by -52.7% | 2026-10-24T05:42:41+00:00 |
| llm/modelsdev/edenai/azure/gpt-5.1-codex-max | modelsdev (community cross-check) | 1.25 | 10.00 | differs differs by -52.7% | 2026-10-24T05:42:41+00:00 |
| llm/modelsdev/jiekou/gpt-5.1-codex-max | modelsdev (community cross-check) | 1.1875 | 9.50 | differs differs by -55.1% | 2026-10-24T05:42:41+00:00 |
| llm/modelsdev/kilo/openai/gpt-5.1-codex-max | modelsdev (community cross-check) | 1.25 | 10.00 | differs differs by -52.7% | 2026-10-24T05:42:41+00:00 |
| llm/modelsdev/nano-gpt/openai/gpt-5.1-codex-max | modelsdev (community cross-check) | 2.50 | 20.00 | differs differs by -5.5% | 2026-10-24T05:42:41+00:00 |
| llm/modelsdev/ofox/openai/gpt-5.1-codex-max | modelsdev (community cross-check) | 1.25 | 10.00 | differs differs by -52.7% | 2026-10-24T05:42:41+00:00 |
| llm/modelsdev/opencode/gpt-5.1-codex-max | modelsdev (community cross-check) | 1.25 | 10.00 | differs differs by -52.7% | 2026-10-24T05:42:41+00:00 |
| llm/modelsdev/openrouter/openai/gpt-5.1-codex-max | modelsdev (community cross-check) | 1.25 | 10.00 | differs differs by -52.7% | 2026-10-24T05:42:41+00:00 |
| llm/modelsdev/poe/openai/gpt-5.1-codex-max | modelsdev (community cross-check) | 1.10 | 9.00 | differs differs by -58.4% | 2026-10-24T05:42:41+00:00 |
Price history (90 days)
| Observed (UTC) | Price | USD | EUR | Output / 1M | Snapshot |
|---|---|---|---|---|---|
| 2026-10-22T17:15:23+00:00 | USD 2.65 | 2.645 | 2.3545 | 21.16 | #725 |
| 2026-10-19T22:42:32+00:00 | USD 3.44 | 3.4385 | 3.0633 | 27.508 | #34 |
Each row is a change point: the price held from that moment until the next row. Full history: JSON · CSV.
Changes
| Seen | Kind | Change |
|---|---|---|
| 2026-10-22T17:15:23+00:00 between 2026-10-22 and 2026-10-22 |
Price change input, per 1M tokens | 3.4385 → 2.645 USD (-23.1%) |
API: /v1/skus/llm/modelsdev/aimlapi/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). modelsdev GPT-5.1-Codex-Max [data as of 2026-10-24]. https://infrarabbit.com/llm/modelsdev/aimlapi/openai/gpt-5.1-codex-max (accessed 2026-10-24). List prices, not transacted prices. CC BY 4.0.
BibTeX
@misc{infrarabbit_llm_modelsdev_aimlapi_openai_gpt_5_1_codex_max_2026,
author = {{InfraRabbit}},
title = {modelsdev GPT-5.1-Codex-Max},
year = {2026},
howpublished = {\url{https://infrarabbit.com/llm/modelsdev/aimlapi/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}
}