GPT-5.6 Sol
No shutdown before this date. GPT-5.6 Sol stays on Amazon Bedrock until at least Jul 13, 2027.
≥ 9 mo- Earliest retirement
- ≥ 272 daysJul 13, 2027 · Amazon Bedrock
- Arena Text
- 1,485#12 of 128 · Arena
- GPQA Diamond
- 93.5%#13 of 108 · Epoch AI
- List price · $ per 1M
- $4.00 in $20.00 outOpenAI API · cached input $0.40
- Context window
- 1.1MMax output 128K tokens
Dates on every platform
| Platform | Model ID and status | Deprecated | Shuts down | Replacement |
|---|---|---|---|---|
| OpenAI APIOpenAI: List models (GET /v1/models) (opens in a new tab) · checked Oct 14, 2026 | gpt-5.6-solActive · also gpt-5.6 | – | None set | – |
| Azure AI FoundryMicrosoft: Model retirement schedule - Microsoft Foundry (opens in a new tab) · checked Oct 14, 2026 | gpt-5.6-sol:2026-07-09Active | – | 15 mo | – |
| Amazon BedrockAmazon Web Services: Amazon Bedrock ListFoundationModels, us-east-1 (opens in a new tab) · checked Oct 14, 2026 | openai.gpt-5.6-solActive · also global.openai.gpt-5.6-sol, us.openai.gpt-5.6-sol | – | ≥ 9 moNot sooner than | – |
The gpt-5.6 alias routes requests to gpt-5.6-sol.
In us-east-1, requests go through a cross-Region inference profile (listed in aliases).
What breaks when you move off GPT-5.6 Sol
- Defaults
- Pricing
Intelligence
| Benchmark | Publisher | Score | Rank | Published |
|---|---|---|---|---|
| Arena Text | Arena | 1,485 ± 2 | #12 of 128 | Oct 8, 2026 |
| GPQA Diamond | Epoch AI | 93.5% ± 1.6% | #13 of 108 | Jul 9, 2026 |
| Arena Agent | Arena | 0 ± 0 | #11 of 35 | Oct 12, 2026 |
| FrontierMath Tier 4 | Epoch AI | 82.9% ± 5.9% | #7 of 58 | Jul 9, 2026 |
| FrontierMath Tiers 1-3 | Epoch AI | 89.1% ± 1.8% | #6 of 71 | Jul 9, 2026 |
| OTIS Mock AIME 2024-2025 | Epoch AI | 100.0% ± 0.0% | #5 of 105 | Jul 9, 2026 |
| SimpleQA Verified | Epoch AI | 69.7% ± 1.5% | #9 of 68 | Aug 10, 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-5.6-sol | $4.00 | $0.40 | $20.00 | Aug 21, 2026Current · Promotional pricing, available at least through 21 November 2026. Requests over 272K input tokens are billed at higher long-context rates. Cache writes are billed separately. Batch and Flex bill less; Fast mode bills more. | OpenAI: Pricing (opens in a new tab) |
Azure AI Foundrygpt-5.6-sol:2026-07-09 | $4.00 | $0.40 | $20.00 | Sep 1, 2026Current · Global Standard short-context rate from the US East 2 price list. Promotional rate from 1 September 2026 through at least 30 November 2026. | Microsoft: Azure Retail Prices API (Foundry Models, US East 2) (opens in a new tab) |
Azure AI Foundrygpt-5.6-sol:2026-07-09 | $5.00 | $0.50 | $30.00 | Jul 9, 2026 to Sep 1, 2026Earlier price · Global Standard short-context rate at launch, before the promotional rate. | Microsoft: GPT-5.6 now available in Microsoft Foundry (opens in a new tab) |
Amazon Bedrockopenai.gpt-5.6-sol | $4.40 | $0.44 | $22.00 | Oct 14, 2026Current · Standard tier, short context (272K input tokens or fewer). In-Region and geographic cross-Region inference; global cross-Region inference is priced lower. | Amazon Web Services: Amazon Bedrock model card: GPT-5.6 Sol (opens in a new tab) |
Change history
ShutdownGPT-4o version 2024-05-13 retires on Azure AI FoundryAzure AI Foundry2 breaks
gpt-4o version 2024-05-13 is deprecated and retires on Foundry. Microsoft lists gpt-5.6-sol as the replacement and will upgrade Standard deployments to it in each region.
- Platform
- Azure AI Foundry
- Model
- GPT-4o
- Replacement
- GPT-5.6 Sol
- 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)
Price changeGPT-5.6 Sol price cut on Azure AI FoundryAzure AI Foundry
Azure OpenAI metered pricing for GPT-5.6 Sol fell 20 percent for input and 33.3 percent for output from 1 September 2026. Microsoft calls it promotional pricing, running through at least 30 November 2026.
- Platform
- Azure AI Foundry
- Model
- GPT-5.6 Sol
Source: Microsoft, GPT-5.6 now available in Microsoft Foundry (opens in a new tab); Microsoft, Azure Retail Prices API (Foundry Models, US East 2) (opens in a new tab)
Price changeGPT-5.6 Sol price cut on the OpenAI APIOpenAI API
GPT-5.6 Sol input pricing fell 20 percent and output pricing 33 percent. OpenAI calls this promotional pricing, available at least through 21 November 2026.
- Platform
- OpenAI API
- Model
- GPT-5.6 Sol
Source: OpenAI, Changelog (opens in a new tab); OpenAI, Pricing (opens in a new tab)
ReleaseGPT-5.6 Luna, Sol and Terra available on Amazon BedrockAmazon Bedrock
Bedrock added GPT-5.6 Luna, GPT-5.6 Sol and GPT-5.6 Terra.
- Platform
- Amazon Bedrock
- Models
- GPT-5.6 Luna, GPT-5.6 Sol, GPT-5.6 Terra
Source: Amazon Web Services, Amazon Bedrock ListFoundationModels, us-east-1 (opens in a new tab)
ShutdownGPT-5.2 Chat and GPT-5.3 Chat shut down on the OpenAI APIOpenAI API
gpt-5.2-chat-latest and gpt-5.3-chat-latest were removed. OpenAI recommends GPT-5.6 Sol.
- Platform
- OpenAI API
- Models
- GPT-5.2 Chat, GPT-5.3 Chat
- Replacement
- GPT-5.6 Sol
- Announced
ReleaseGPT-5.6 Sol, Terra and Luna available on Azure AI FoundryAzure AI Foundry
Microsoft made the GPT-5.6 series generally available in Foundry Models and Foundry Agent Service, with Global Standard, Global Priority Processing, Data Zone Standard and Global Provisioned deployments from day one.
- Platform
- Azure AI Foundry
- Models
- GPT-5.6 Sol, GPT-5.6 Terra, GPT-5.6 Luna
Source: Microsoft, GPT-5.6 now available in Microsoft Foundry (opens in a new tab)
ReleaseGPT-5.6 Sol, Terra and Luna released on the OpenAI APIOpenAI API2 breaks
OpenAI released the GPT-5.6 family: Sol for frontier capability, Terra for a balance of intelligence and cost, and Luna for high-volume work. The gpt-5.6 alias routes to gpt-5.6-sol. The family adds programmatic tool calling, explicit prompt caching controls, persisted reasoning, max reasoning effort and pro mode.
- Platform
- OpenAI API
- Models
- GPT-5.6 Sol, GPT-5.6 Terra, GPT-5.6 Luna
- 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, Changelog (opens in a new tab); OpenAI, Using GPT-5.6 (opens in a new tab)