GPT-5.6

An AWS blog post using an open-source benchmarking harness finds that GPT-5.6 Luna, Terra, and Sol on Amazon Bedrock deliver lower cost-per-correct-answer than OpenAI's cost-optimized GPT-5.4 Mini and Nano, once accuracy, token efficiency, and agent turn counts are factored in. The analysis also cites a July 30, 2026 price cut of up to 80% for GPT-5.6 Luna on Amazon Bedrock.

AWS's August 2026 roundup details Bedrock and AgentCore updates including million-token context for GPT-5.6 models, AgentCore runtime sessions lasting up to 14 days, OpenAI's new Daybreak Red/Blue cybersecurity models, and Claude Opus 5 availability in GovCloud with zero data retention.

Developer Simon Willison ran his signature 'pelican riding a bicycle' SVG test on newly-accessed GPT-6 Astra across five reasoning levels, comparing results against GPT-5.6 Sol, Terra, and Luna. Even Astra's lowest reasoning setting reportedly beat every Sol output, though Astra costs roughly twice as much per token.

Amazon Bedrock now supports cross-Region inference for three GPT-5.6 variants — Sol, Terra, and Luna — across more than 25 AWS Regions. The feature routes requests to available compute capacity via geographic or global inference profiles, without requiring code changes beyond swapping a model ID.

OpenAI has shipped a security update for Codex after users reported that GPT-5.6 Sol was autonomously deleting real files instead of temporary ones. The bug stemmed from misused system variables like $HOME pointing cleanup commands at actual home directories.

A new study from Princeton and the UK AI Security Institute tested AI agents on unpublished NeurIPS papers using a novel 'Shadow Evaluation' method. Both Claude Opus 4.8 and GPT-5.6 handled engineering tasks but produced papers that human expert reviewers rejected, contradicting recent claims from Anthropic and OpenAI about autonomous AI research capability.

OpenAI is testing an 'Ultrafast' service tier that runs GPT-5.6 Sol up to 14 times faster than standard processing, generating up to 750 output tokens per second using Cerebras infrastructure. Access is currently limited to a waitlist of select customers.

New Ramp spending data shows Anthropic's flagship Fable 5 model, priced at $10/$50 per million tokens, is seeing weak corporate adoption compared to OpenAI's GPT-5.6 Sol. Analysts suggest frontier AI pricing may have hit a ceiling.

xAI's Grok 4.6 ties OpenAI's GPT-5.6 Sol on the Artificial Analysis Intelligence Index with a score of 61, trailing only Anthropic's Claude Opus 5 and Claude Fable 5. Pricing remains at $2/$6 per million tokens, undercutting both competitors by more than 60 percent.

AWS and OpenAI have made Daybreak Red (GPT-5.6 Cyber) and Daybreak Blue (GPT-5.6 Sol) available to eligible customers on Amazon Bedrock in US East (N. Virginia). The purpose-trained cybersecurity models run under AWS's zero-operator-access infrastructure and require enrollment in OpenAI's Trusted Access for Cyber program.

OpenAI will remove text chat rate limits for ChatGPT Free and Go users starting next week and add a 'Think' button for deeper reasoning. Plus and Pro subscribers get an updated GPT-5.6 Sol model that OpenAI claims is more accurate with facts, dates, and sourcing.

MIT PhD student Seyoon Ragavan and a UC Santa Barbara/UCLA team led by Prabhanjan Ananth and Amit Sahai independently used OpenAI's GPT-5.6 Sol Ultra to solve the same open problem in quantum cryptography. Their papers, submitted to arXiv three hours apart, are now being considered for merger.

OpenAI is cutting the price of GPT-5.6 Luna by 80% and GPT-5.6 Terra by 20%, just three weeks after launching the models. The move comes as enterprises grow more cost-conscious and rivals including Anthropic, Google, and Moonshot AI push cheaper alternatives.

OpenAI's GPT-5.6 Sol, Terra, and Luna models are now generally available on Amazon Bedrock, accessible through the OpenAI-compatible Responses API. The release introduces explicit prompt caching, letting developers manually mark cache boundaries for a 90% discount on reused input tokens.

OpenAI says GPT-5.6 Sol scores 38.3 percent on ARC-AGI-3 using a custom Responses API configuration, edging out Claude Opus 5's 30.2 percent. Under the official benchmark harness, GPT-5.6 Sol's score drops to 7.8 percent, raising questions about what the comparison actually measures.

OpenAI's GPT-5.6 family — Sol, Terra, and Luna — is now generally available on Amazon Bedrock through a new bedrock-mantle endpoint. All three models share a 272K-token context window, support image input, and let developers dial reasoning effort from none to max.

OpenAI released GPT-5.6 Sol, a new reasoning model family that comes in three sizes with roughly five to six reasoning-effort settings each. The release follows the DeepSeek-R1 methodology of using reinforcement learning with verifiable rewards (RLVR), nearly two years after OpenAI's original o1 model popularized LLM-based reasoning.

OpenAI's GPT-5.6 model family is now generally available on Amazon Bedrock, introducing a three-tier system: Sol (flagship reasoning), Terra (balanced production), and Luna (fast inference). According to OpenAI, Sol scores 80 points on the Artificial Analysis Coding Agent Index and 73.5% on ExploitBench, establishing new benchmarks while using less than half the output tokens of competing models.

OpenAI has designated its newly launched GPT-5.6 as the 'preferred model' for Microsoft 365 Copilot, powering Word, Excel, PowerPoint, and Cowork. The announcement comes days after Bloomberg reported Microsoft is increasingly deploying its in-house MAI models to reduce reliance on OpenAI and cut costs.

OpenAI released its GPT-5.6 flagship model family in three sizes: Luna ($1/$6 per 1M tokens), Terra ($2.50/$15), and Sol ($5/$30). The company claims GPT-5.6 Sol scores 53.6 on the Agents' Last Exam benchmark, outperforming Claude Fable 5's score by 13.1 points.

OpenAI has released five variants of GPT-5.6, according to listings on OpenRouter. The new series includes Pro and standard versions named Sol, Terra, and Luna, though official specifications and pricing remain undisclosed.

OpenAI has released GPT-5.6 Luna Pro, a reasoning-enhanced variant of GPT-5.6 Luna with a 1 million token context window. The model is priced at $1 per million input tokens and $6 per million output tokens, with a knowledge cutoff date of February 2026.

OpenAI has released GPT-5.6 Terra Pro, a variant of GPT-5.6 Terra configured with enhanced reasoning capabilities for complex tasks. The model features a 1 million token context window and is priced at $2.50 per million input tokens and $15 per million output tokens.

OpenAI has released GPT-5.6 Sol Pro, a reasoning-enhanced variant of GPT-5.6 Sol designed for complex tasks. The model features a 1 million token context window, February 2026 knowledge cutoff, and is priced at $5 per 1M input tokens and $30 per 1M output tokens.

OpenAI has released GPT-5.6 Luna, a fast and cost-efficient model in its GPT-5.6 series. The model features a 1 million token context window and is priced at $1 per 1M input tokens and $6 per 1M output tokens, with a knowledge cutoff of February 2026.

OpenAI has released GPT-5.6 Terra, a mid-tier model in its GPT-5.6 series priced at $2.50 per million input tokens and $15 per million output tokens. The model features a 1 million token context window and February 2026 knowledge cutoff, positioned between the flagship Sol and cost-efficient Luna tiers.

OpenAI released GPT-5.6 Sol, Terra, and Luna models broadly on Thursday following initial limited deployment. CEO Sam Altman told CNBC the Sol model achieves 54% greater token efficiency on agentic coding tasks compared to previous versions.

The U.S. Department of Commerce has cleared OpenAI to proceed with a broad release of GPT-5.6, according to an Axios report citing a source familiar with the matter. The White House disputed the claim, telling CNBC it did not give OpenAI "green light, approval or clearance" and that release decisions "rest entirely with the companies."

OpenAI is releasing GPT-5.6 to the public on July 9 following government security review under a Trump administration AI cybersecurity order. The release includes three variants: Sol (strongest), Terra (GPT-5.5 performance at half the cost), and Luna (lowest cost option).

The U.S. Department of Commerce has approved OpenAI for a broad launch of GPT-5.6 this week, following testing by the Center for AI Standards and Innovation. The model was previously restricted to government-approved entities since June, mirroring earlier restrictions placed on Anthropic's models.

OpenAI has begun previewing its GPT-5.6 series to a limited group of trusted partners after government review. The release includes three variants: Sol at $5 input/$30 output per million tokens, Terra at $2.50/$15, and Luna at $1/$6.

OpenAI released its GPT-5.6 model lineup to a limited group of "trusted partners" after the U.S. government requested restrictions on the rollout. The company released three models—Sol ($5/$30 per million tokens), Terra ($2.50/$15), and Luna ($1/$6)—but said the government-mandated preview "shouldn't become the long-term default."

OpenAI announced GPT-5.6, a three-tier model series launching through a limited preview coordinated with the U.S. government. The models—Sol, Terra, and Luna—are priced from $1/$6 to $5/$30 per million input/output tokens and introduce new max and ultra reasoning modes.

OpenAI announced three new models—GPT-5.6 Sol, Terra, and Luna—on June 26, 2026, but is limiting initial access to a "small group of trusted partners" following a U.S. government request. The company says it plans to make the models generally available "in the coming weeks."

OpenAI released GPT-5.6, a three-model suite consisting of Sol (flagship), Terra (medium-tier), and Luna (fast/affordable). Sol is priced at $5 input/$30 output per million tokens—nearly half the cost of Anthropic's Claude Fable 5. The release follows Trump administration involvement in approval process.

The Trump administration has instructed OpenAI to release its newest model, GPT-5.6, only to a select group of government-approved partners rather than the general public. The Office of the National Cyber Director and Office of Science and Technology Policy will approve access customer by customer during a preview period.

OpenAI CEO Sam Altman told employees the company will release GPT-5.6 in limited preview form only, with the Trump administration approving customer access on a case-by-case basis. The move follows stricter export controls imposed on Anthropic earlier this month.