GPT-5.6 Sol Model | OpenAI API

ModelsGPT-5.6 SolDefaultFrontier model for complex professional workFrontier model for complex professional workReasoningHighestSpeedFastPrice$4•$20Input•OutputInputText, imageOutputTextGPT-5.6 Sol is the frontier model in the GPT-5.6 family. It roughly corresponds to the unsuffixed model tier used in earlier GPT-5 families. The gpt-5.6 alias routes requests to GPT-5.6 Sol. Reasoning.effort supports: none, low, medium (default), high, xhigh, and max.1,050,000 context window128,000 max output tokensFeb 16, 2026 knowledge cutoffReasoning token supportPricingPricing is based on the number of tokens used, or other metrics based on the model type. For tool-specific models, like search and computer use, there’s a fee per tool call. See details in the pricing page.Text tokensPer 1M tokensInput$4.00Cached input$0.40Output$20.00Quick comparisonInputCached inputOutputGPT-5.5$5.00GPT-5.6 Sol$4.00GPT-5.4$2.50GPT-5.6 Sol costs $4 per million input tokens and $20 per million output tokens, a 20% reduction in input pricing and a 33% reduction in output pricing. GPT-5.6 Sol’s promotional pricing is available at least through November 21, 2026.Prompts with >272K input tokens are priced at 2x input and 1.5x output for the full request.Cache writes are billed at 1.25x the uncached input token rate.ModalitiesTextInput and outputImageInput onlyAudioNot supportedVideoNot supportedEndpointsChat Completionsv1/chat/completionsResponsesv1/responsesRealtimev1/realtimeRealtime translationv1/realtime/translationsRealtime transcriptionv1/realtime/transcription_sessionsAssistantsv1/assistantsBatchv1/batchFine-tuningv1/fine-tuningEmbeddingsv1/embeddingsImage generationv1/images/generationsVideosv1/videosImage editv1/images/editsSpeech generationv1/audio/speechTranscriptionv1/audio/transcriptionsTranslationv1/audio/translationsModerationv1/moderationsCompletions (legacy)v1/completionsFeaturesStreamingSupportedFunction callingSupportedStructured outputsSupportedFine-tuningNot supportedToolsTools supported by this model when using the Responses API.Web searchSupportedFile searchSupportedImage generationSupportedCode interpreterSupportedHosted shellSupportedApply patchSupportedSkillsSupportedComputer useSupportedMCPSupportedTool searchSupportedSnapshotsSnapshots let you lock in a specific version of the model so that performance and behavior remain consistent. Below is a list of all available snapshots and aliases for GPT-5.6 Sol.gpt-5.6-solgpt-5.6-solgpt-5.6-solRate limitsRate limits ensure fair and reliable access to the API by placing specific caps on requests, tokens, audio duration, or other usage within a given time period. Your usage tier determines how high these limits are set and automatically increases as you send more requests and spend more on the API.TierRPMTPMBatch queue limitFreeNot supportedTier 1500500,0001,500,000Tier 25,0001,000,0003,000,000Tier 35,0002,000,000100,000,000Tier 410,0004,000,000200,000,000Tier 515,00040,000,00015,000,000,000