GPT-4.1 nano
Shutting down. GPT-4.1 nano shuts down on the OpenAI API on Oct 23, 2026. OpenAI names GPT-5.6 Luna as the replacement.
9 days- Next shutdown
- 9 daysOct 23, 2026 · OpenAI API
- Arena Text
- 1,322#106 of 128 · Arena
- GPQA Diamond
- 48.9%#91 of 108 · Epoch AI
- List price · $ per 1M
- $0.10 in $0.40 outOpenAI API · cached input $0.025
- Context window
- 1MMax output 32.8K tokens
Dates on every platform
| Platform | Model ID and status | Deprecated | Shuts down | Replacement |
|---|---|---|---|---|
| OpenAI APIOpenAI: Deprecations (opens in a new tab) · checked Oct 14, 2026 | gpt-4.1-nanoDeprecated · also gpt-4.1-nano-2025-04-14 | 9 days | GPT-5.6 Luna | |
| Azure AI FoundryMicrosoft: Model retirement schedule - Microsoft Foundry (opens in a new tab) · checked Oct 14, 2026 | gpt-4.1-nano:2025-04-14Deprecated | – | 6 mo | – |
Fine-tuned versions of this model follow the same shutdown date.
Deprecated on Azure: only subscriptions that have already deployed this version can create new deployments.
Microsoft names a replacement about 90 to 120 days before retirement.
What breaks when you move off GPT-4.1 nano
- Behavior
Standard, Global Standard and Data Zone Standard deployments are upgraded to the replacement automatically unless versionUpgradeOption is NoAutoUpgrade. Provisioned deployments are not upgraded and stop working at retirement.
GPT-4.1, GPT-4.1 Mini, GPT-4.1 nano, GPT-4o, GPT-4o Mini · Azure AI Foundry ·
- Availability
- Parameters
- Defaults
- Pricing
Intelligence
| Benchmark | Publisher | Score | Rank | Published |
|---|---|---|---|---|
| Arena Text | Arena | 1,322 ± 4 | #106 of 128 | Oct 8, 2026 |
| GPQA Diamond | Epoch AI | 48.9% ± 2.5% | #91 of 108 | Apr 14, 2025 |
| OTIS Mock AIME 2024-2025 | Epoch AI | 28.9% ± 6.0% | #84 of 105 | Apr 14, 2025 |
| SimpleQA Verified | Epoch AI | 6.0% ± 0.8% | #68 of 68 | Aug 31, 2026 |
Arena (arena.ai), https://arena.ai/leaderboard
Epoch AI, ‘Capabilities & benchmarking’. Published online at epoch.ai. Retrieved from ‘https://epoch.ai/benchmarks’ [online resource].
List prices
| Platform | Input | Cached | Output | In effect | Source |
|---|---|---|---|---|---|
OpenAI APIgpt-4.1-nano | $0.10 | $0.025 | $0.40 | Oct 14, 2026Current · Batch and Flex bill less; Fast mode bills more. | OpenAI: Pricing (opens in a new tab) |
Azure AI Foundrygpt-4.1-nano:2025-04-14 | $0.10 | $0.025 | $0.40 | Apr 14, 2025Current · Global Standard rate from the US East 2 price list. | Microsoft: Azure Retail Prices API (Foundry Models, US East 2) (opens in a new tab) |
Change history
ShutdownGPT-4.1 and remaining GPT-4o versions retire on Azure AI FoundryAzure AI Foundry2 breaks
gpt-4.1, gpt-4.1-mini and gpt-4.1-nano (2025-04-14), gpt-4o (2024-08-06 and 2024-11-20) and gpt-4o-mini (2024-07-18) retire on Foundry, three months after OpenAI's own shutdown of these models. Microsoft lists gpt-5.1 as the replacement for the two gpt-4o versions. Fine-tuned deployments of these models run until October 2027.
- Platform
- Azure AI Foundry
- Models
- GPT-4.1, GPT-4.1 Mini, GPT-4.1 nano, GPT-4o, GPT-4o Mini
- BehaviorStandard, Global Standard and Data Zone Standard deployments are upgraded to the replacement automatically unless versionUpgradeOption is NoAutoUpgrade. Provisioned deployments are not upgraded and stop working at retirement.
- AvailabilityInference requests to retired deployments return 410 Gone.
Source: Microsoft, Model retirement schedule - Microsoft Foundry (opens in a new tab); Microsoft, Microsoft Foundry Models lifecycle and support policy (opens in a new tab)
ShutdownLegacy GPT and o-series snapshots shut down on the OpenAI APIOpenAI API3 breaks
Requests to gpt-3.5-turbo-0125, gpt-4-0613, gpt-4-turbo, gpt-4.1-nano, gpt-4o-2024-05-13, o1, o1-pro, o3-mini and o4-mini, and their aliases, fail after the shutdown date. OpenAI names GPT-5.6 Sol, Terra or Luna as the substitute for each. Fine-tuned gpt-3.5-turbo, gpt-4, gpt-4.1-nano and o4-mini models shut down the same day.
- Platform
- OpenAI API
- Models
- GPT-3.5 Turbo, GPT-4, GPT-4 Turbo, GPT-4.1 nano, GPT-4o, o1, o1-pro, o3-mini, o4-mini
- Announced
- ParametersPro snapshots move to gpt-5.6-sol with reasoning.mode set to pro. There is no separate Pro model ID for GPT-5.6.
- DefaultsGPT-5.6 models reuse reasoning across turns by default (reasoning.context all_turns); earlier models default to current_turn.
- PricingGPT-5.6 bills cache writes at 1.25 times the uncached input rate. Replace prompt_cache_retention with prompt_cache_options.ttl.
Source: OpenAI, Deprecations (opens in a new tab); OpenAI, Using GPT-5.6 (opens in a new tab)