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ModelsOpenAIGPT-5.1-Codex

GPT-5.1-Codex

Retired: The model's withdrawal, announced by its lab or by every seller listing it · Retired Jul 23, 2026 · announced on developers.openai.com · read on Oct 31, 2026 · announced replacement: GPT-5.6 Sol (opens in a new tab)
openai/gpt-5.1-codex Compare →
Offers
13
Providers
9

Cheapest right now

No offer is selected as the cheapest right now: each of the lowest prices listed below says why on its row.

No change7DSee the 13 offers

Public leaderboards

  • Code Arena (WebDev)The Code Arena ranking (WebDev). The source publishes no style-corrected series (as read on 9 October 2026). #119 of 152Best rank in the source's rank spread, 119th to 130th, given the confidence intervals of all ranked models. 126th by score. 1,337 1,326 to 1,349Arena Score · 4,981 votes

Source: Arena (opens in a new tab) · Data under the CC BY 4.0 license (creativecommons.org/licenses/by/4.0) · CC BY 4.0 (opens in a new tab) · scores and ranks as published on 28 Oct 2026; the presentation is ours

Cheapest, no training on prompts

No offer with a published no-training policy for this model.

Price historyThe cheapest offer each day, against the lab's official list price when it publishes one. Each day at 00:00 UTC, the offer the API would have selected as the cheapest, with the same exclusions as /cheapest. Blended price, promotions included.

Cheapest offer and official list price, by day, 30 days
DayCheapest offerOfficial list price
2026-10-02$3.44, Azure–
2026-10-03$3.44, Azure–
2026-10-04$3.44, Azure–
2026-10-05$3.44, Azure–
2026-10-06$3.44, OpenAI–
2026-10-07$3.44, OpenAI–
2026-10-08$3.44, OpenAI–
2026-10-09$3.44, OpenAI–
2026-10-10$3.44, OpenAI–
2026-10-11$3.44, OpenAI–
2026-10-12$3.44, OpenAI–
2026-10-13$3.44, OpenAI–
2026-10-14$3.44, OpenAI–
2026-10-15$3.44, OpenAI–
2026-10-16$3.44, OpenAI–
2026-10-17$3.44, OpenAI–
2026-10-18$3.44, OpenAI–
2026-10-19$3.44, Azure–
2026-10-20$3.44, Azure–
2026-10-21$3.44, Azure–
2026-10-22$3.44, Azure–
2026-10-23$3.44, Azure–
2026-10-24$3.44, Azure–
2026-10-25$3.44, Azure–
2026-10-26$3.44, NanoGPT–
2026-10-27$3.44, Azure–
2026-10-29$3.44, Azure–
2026-10-30$3.44, Azure–

Cheapest offer

Offers

13 of 13 offers

Offers for GPT-5.1-Codex, one row per offer, sorted by blended price.
RankProvider · viaYou buy access through an aggregator: one account and one API that forward your requests to other providers. "Via" names the aggregator; the price is the one it charges you. When "via" says "hosted API", no aggregator is involved: the model belongs to a lab and another provider sells it.Input $/1MOutput $/1MBlended $/1MA single price that mixes input and output: 3 input tokens for 1 output token, per million tokens. It makes offers easy to rank; your real cost depends on your own mix. ContextThe maximum amount of text, counted in tokens, the model can take in and write in a single request. Past this limit, the request is refused or cut.ConditionsWhat a provider says about how it handles your data and who can sign up: training on prompts, processing region, sign-up requirements. Each comes from the provider's published documents; when nothing is published, it stays unknown.SignalsOffer
1 NanoGPT 1.25 10.00 3.44 400k Unverified. Withdrawn by its lab; this seller has not shown it for sale for 72 hours: listed, not designated cheapest · last confirmed 31 October 2026
Go to offer at NanoGPT (opens in a new tab)
2 Azurevia Eden AI 1.25 10.00 3.44 272k Unverified. Withdrawn by its lab; this seller has not shown it for sale for 72 hours: listed, not designated cheapest
: Eden AI (opens in a new tab). No public price page for this model
3 Azurevia Kilo Gateway 1.25 10.00 3.44 400k Unverified. Withdrawn by its lab; this seller has not shown it for sale for 72 hours: listed, not designated cheapest
Go to offer at Kilo Gateway (opens in a new tab)
4 Azurevia LLM API 1.25 10.00 3.44 – Unconfirmed. Last checked 18 October 2026: the last published value, not a confirmed one Unverified. Withdrawn by its lab; this seller has not shown it for sale for 72 hours: listed, not designated cheapest
See pricing at LLM API (opens in a new tab)
5 Glama 1.25 10.00 3.44 400k Unverified. Withdrawn by its lab; this seller has not shown it for sale for 72 hours: listed, not designated cheapest
: Glama (opens in a new tab). No public price page for this model
6 Nous Portal 1.25 10.00 3.44 400k Unverified. Withdrawn by its lab; this seller has not shown it for sale for 72 hours: listed, not designated cheapest
See pricing at Nous Portal (opens in a new tab)
7 OrcaRouter 1.25 10.00 3.44 400k Unverified. Withdrawn by its lab; this seller has not shown it for sale for 72 hours: listed, not designated cheapest
Go to offer at OrcaRouter (opens in a new tab)
8 Vercel AI Gateway 1.25 10.00 3.44 – Unverified. Withdrawn by its lab; this seller has not shown it for sale for 72 hours: listed, not designated cheapest
Go to offer at Vercel AI Gateway (opens in a new tab)
9 ZenMux 1.25 10.00 3.44 400k Unverified. Withdrawn by its lab; this seller has not shown it for sale for 72 hours: listed, not designated cheapest
Go to offer at ZenMux (opens in a new tab)
10 Azurevia LLM Gateway 1.25 10.00 3.44 – Unverified. Withdrawn by its lab; this seller has not shown it for sale for 72 hours: listed, not designated cheapest · last confirmed 30 October 2026Fee 5%: LLM Gateway adds a 5% fee on credit usage, plus 1.5% for cards issued outside the US (read on llmgateway.io/pricing on Oct 31). Offers are ranked with the 5% included.
Go to offer at LLM Gateway (opens in a new tab)
11 OpenAIvia LLM Gateway 1.25 10.00 3.44 – Fee 5%: LLM Gateway adds a 5% fee on credit usage, plus 1.5% for cards issued outside the US (read on llmgateway.io/pricing on Oct 31). Offers are ranked with the 5% included.
Go to offer at LLM Gateway (opens in a new tab)
12 Azurevia OpenRouter 1.25 10.00 3.44 400k Unverified. Withdrawn by its lab; this seller has not shown it for sale for 72 hours: listed, not designated cheapest · last confirmed 31 October 2026Fee 5.5%: OpenRouter adds a 5.5% fee when you buy credits (read on openrouter.ai/pricing on Oct 31). Offers are ranked with this fee included.
Go to offer at OpenRouter (opens in a new tab)
13 ShengSuanYun 1.32 10.52 3.62 400k Unverified. Withdrawn by its lab; this seller has not shown it for sale for 72 hours: listed, not designated cheapest
: ShengSuanYun (opens in a new tab). No public price page for this model

No training on promptsPrompts may be used for trainingTraining terms not published

backend not named. The router bills this price itself without naming who serves the model.

  • NanoGPT

    $3.44

    NanoGPT

    in
    $1.25
    out
    $10.00
    Context
    400k

    No training on promptsUnverified. Withdrawn by its lab; this seller has not shown it for sale for 72 hours: listed, not designated cheapest · last confirmed 31 October 2026

    Go to offer Go to offer at NanoGPT (opens in a new tab)via NanoGPT

  • Azure

    $3.44

    Eden AI

    in
    $1.25
    out
    $10.00
    Context
    272k

    Prompts may be used for trainingUnverified. Withdrawn by its lab; this seller has not shown it for sale for 72 hours: listed, not designated cheapest

    Seller's site: Eden AI (opens in a new tab)No public price page for this model

  • Azure

    $3.44

    Kilo Gateway

    in
    $1.25
    out
    $10.00
    Context
    400k

    Training terms not publishedUnverified. Withdrawn by its lab; this seller has not shown it for sale for 72 hours: listed, not designated cheapest

    Go to offer Go to offer at Kilo Gateway (opens in a new tab)via Kilo Gateway

  • Azure

    $3.44

    LLM API

    in
    $1.25
    out
    $10.00
    Context
    –

    No training on promptsUnconfirmed. Last checked 18 October 2026: the last published value, not a confirmed oneUnverified. Withdrawn by its lab; this seller has not shown it for sale for 72 hours: listed, not designated cheapest

    See pricing See pricing at LLM API (opens in a new tab)via LLM API

  • Glama

    $3.44

    Glama

    in
    $1.25
    out
    $10.00
    Context
    400k

    No training on promptsUnverified. Withdrawn by its lab; this seller has not shown it for sale for 72 hours: listed, not designated cheapestbackend not named: The router bills this price itself without naming who serves the model.

    Seller's site: Glama (opens in a new tab)No public price page for this model

  • Nous Portal

    $3.44

    Nous Portal

    in
    $1.25
    out
    $10.00
    Context
    400k

    Prompts may be used for trainingUnverified. Withdrawn by its lab; this seller has not shown it for sale for 72 hours: listed, not designated cheapestbackend not named: The router bills this price itself without naming who serves the model.

    See pricing See pricing at Nous Portal (opens in a new tab)via Nous Portal

  • OrcaRouter

    $3.44

    OrcaRouter

    in
    $1.25
    out
    $10.00
    Context
    400k

    Training terms not publishedUnverified. Withdrawn by its lab; this seller has not shown it for sale for 72 hours: listed, not designated cheapestbackend not named: The router bills this price itself without naming who serves the model.

    Go to offer Go to offer at OrcaRouter (opens in a new tab)via OrcaRouter

  • Vercel AI Gateway

    $3.44

    Vercel AI Gateway

    in
    $1.25
    out
    $10.00
    Context
    –

    No training on promptsUnverified. Withdrawn by its lab; this seller has not shown it for sale for 72 hours: listed, not designated cheapest

    Go to offer Go to offer at Vercel AI Gateway (opens in a new tab)via Vercel AI Gateway

  • ZenMux

    $3.44

    ZenMux

    in
    $1.25
    out
    $10.00
    Context
    400k

    Prompts may be used for trainingUnverified. Withdrawn by its lab; this seller has not shown it for sale for 72 hours: listed, not designated cheapest

    Go to offer Go to offer at ZenMux (opens in a new tab)via ZenMux

  • Azure

    $3.44

    LLM Gateway

    in
    $1.25
    out
    $10.00
    Context
    –

    No training on promptsUnverified. Withdrawn by its lab; this seller has not shown it for sale for 72 hours: listed, not designated cheapest · last confirmed 30 October 2026Fee 5%: LLM Gateway adds a 5% fee on credit usage, plus 1.5% for cards issued outside the US (read on llmgateway.io/pricing on Oct 31). Offers are ranked with the 5% included.

    Go to offer Go to offer at LLM Gateway (opens in a new tab)via LLM Gateway

  • OpenAI

    $3.44

    LLM Gateway

    in
    $1.25
    out
    $10.00
    Context
    –

    No training on promptsFee 5%: LLM Gateway adds a 5% fee on credit usage, plus 1.5% for cards issued outside the US (read on llmgateway.io/pricing on Oct 31). Offers are ranked with the 5% included.

    Go to offer Go to offer at LLM Gateway (opens in a new tab)via LLM Gateway

  • Azure

    $3.44

    OpenRouter

    in
    $1.25
    out
    $10.00
    Context
    400k

    No training on promptsUnverified. Withdrawn by its lab; this seller has not shown it for sale for 72 hours: listed, not designated cheapest · last confirmed 31 October 2026Fee 5.5%: OpenRouter adds a 5.5% fee when you buy credits (read on openrouter.ai/pricing on Oct 31). Offers are ranked with this fee included.

    Go to offer Go to offer at OpenRouter (opens in a new tab)via OpenRouter

  • ShengSuanYun

    $3.62

    ShengSuanYun

    in
    $1.32
    out
    $10.52
    Context
    400k

    Training terms not publishedUnverified. Withdrawn by its lab; this seller has not shown it for sale for 72 hours: listed, not designated cheapest

    Seller's site: ShengSuanYun (opens in a new tab)No public price page for this model

Blended = (3 × input + output) / 4, per million tokens. Prices in USD, converted at the ECB rate when the provider bills in another currency.

Method

Related models

Announced replacement GPT-5.6 Sol

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The index is queryable. The API is free to use.
Free API
curl https://api.inferindex.dev/cheapest?model=openai/gpt-5.1-codex
MCP server
claude mcp add --transport http inferindex https://mcp.inferindex.dev/mcp

Also works in Cursor and Codex: see the MCP page.