GPT-6 Astra vs Claude Opus 5/Fable 5.1 vs Gemini 3.8 Flash vs GPT-5.6 Sol: Computer-Use Agents Change What Agencies Can Automate

Published September 3, 2026By ABD Legacy LLC
GPT-6 AstraComputer-use agentsModel comparisonOpenAI pricing

What happened. OpenAI launched GPT-6 Astra on September 3, 2026, its new flagship and what it calls "the most intelligent and aligned model in the world" — positioning Astra as a computer-use model with the tagline "Anything you can do on a computer, Astra can do for you. Fast." It is also the first model to reach OpenAI's Critical tier of cybersecurity capability under its Preparedness Framework, which is why launch access is deliberately narrow: it began rolling out to a limited set of organizations in OpenAI's Trusted Access Program and its Daybreak cybersecurity program, with ChatGPT Plus, Pro, Business, and Enterprise, the OpenAI API, and AWS to follow "in the coming days" (OpenAI; 9to5Mac; CNET). This is the model-comparison entry for the same tooling watch as our Gemini 3.8 Flash, Claude Fable 5.1, and Grok Bot coverage, with one new variable: agencies can now hand an AI agent the keyboard.

The pricing story. GPT-6 Astra is the most expensive model OpenAI has ever shipped on a per-token basis (Codersera): $10 per 1M input tokens and $50 per 1M output tokens, with cached input at $1, cache writes at $12.50, and a 1.05M-token context window (OpenAI model card; llm-stats rounds to 1.1M) with 128K max output and an April 30, 2026 knowledge cutoff. The structural detail that matters most for long-context work: prompts above 272K input tokens reprice the entire request — 2x the input and cache rates and 1.5x the output rate ($20 / $2 / $75 per 1M) — so crossing the threshold by a single token roughly doubles the cost of the whole call (OpenAI docs; Codersera). Batch and Flex run at 50% of standard rates, Fast mode at 2x, and OpenAI notes a per-tool-call fee for tool-specific models like search and computer use.

GPT-6 Astra vs Claude Opus 5 vs Claude Fable 5.1 vs Gemini 3.8 Flash vs GPT-5.6 Sol

Here is the field as of September 3, 2026. Pricing rows are verified against the model pages on this site, OpenAI's published model card, and launch coverage; benchmark figures are labeled by who reported them.

ModelReleasedPrice per 1M tokensContext in / outComputer useAccess
GPT-6 Astra (new)Sept 3, 2026$10 in / $50 out; $1 cached in; >272K-input prompts reprice the whole request at $20/$751.05M in / 128K outFlagship: OpenAI-reported 72.6% on OSWorld V2-Offline sim vs 65.7% for GPT-5.6 Sol, avg time per task ~75→40 min; WIRED hands-on: DMV bookings, job-listings search, apartment huntingTrusted Access + Daybreak orgs first; ChatGPT plans, API, AWS "in coming days"; not on free tier or Bedrock yet
Claude Fable 5.1Sept 1, 2026$10 in / $50 out; $0.25 cached reads; no long-context premium at 1M1M in / 128K outAnthropic-reported 77.9% on OSWorld (different release — Anthropic says not comparable to older scores); background computer use on Mac shipped Sept 2Generally available; Mythos 5.1 variant is trusted-access only
Claude Opus 5July 24, 2026$5 in / $25 out1M inAnthropic's previous computer-use flagship tier; still the value pick for most workloadsGenerally available
Gemini 3.8 FlashSept 2, 2026$0.75 in / $3.75 out*1M (Flash family)**Improved OSWorld-2.0 over 3.7 Flash, still trailing Claude Opus per Ars TechnicaPublic Gemini API, AI Studio, Antigravity
GPT-5.6 SolAug 2026 promo$4 in / $20 out***1.05M in / 128K outPrior OpenAI computer-use standard (GPT-5.4→5.6 lineage); independent trackers put Sol above Gemini 3.8 Flash on OSWorld 2.0Public API + Bedrock; GPT-5.6 Cyber variants approval-gated via Daybreak Red

*Gemini 3.8 Flash introductory rate through December 31, 2026; $1.50/$7.50 thereafter (Ars Technica; Thurrott). **Google lists no separate 3.8 context figure; 3.7 Flash documented a 1M-token window. ***GPT-5.6 Sol promotional through at least November 21, 2026; expected to revert to $5/$30 after the window.

Read the benchmark line carefully. OpenAI's launch claims — state-of-the-art on FrontierMath Tier 4 (98%), ARC-AGI 3 (99.9%), ExploitBench (100%), Agents' Last Exam, AutomationBench, ScreenSpot Pro, TerminalBench-4.0, plus major advances on Terminal-Bench Science 0.1 and HealthBench Pro — are vendor-reported and were not independently verified at publication. The 72.6% OSWorld V2-Offline figure is OpenAI's own test on its simulation release; Anthropic's higher 77.9% for Fable 5.1 sits on a different OSWorld release that Anthropic itself says should not be compared with earlier scores (The New Stack). Reported third-party numbers such as 59.3% on Agents' Last Exam (kie.ai) and 100% ExploitBench / 72.6% OSWorld (kie.ai, cited in launch coverage) come from launch-day trackers, not peer review. Treat every number as launch-week, lab-reported, and moving.

The computer-use story: what Astra actually does on a machine

Astra's upgrade to ChatGPT and Codex desktop is background computer use: OpenAI says the model can operate your Mac or other desktop in the background while you work, pairing computer-use advances with training on professional environments to carry out multistep workflows (9to5Mac). In OpenAI's own tests reported by WIRED, Astra booked DMV appointments, searched job listings, and apartment-hunted faster than the average person. On the OSWorld V2-Offline benchmark, OpenAI says Astra scored 72.6% versus 65.7% for GPT-5.6 Sol and cut the average time per task from about 75 minutes to 40 (The New Stack). OpenAI also demonstrated Astra operating KiCad, Excel, Blender, and Power BI plus browser form entry and website QA.

Context that keeps this honest: OpenAI is not alone in this lane. Anthropic shipped background computer use for Claude on Mac on September 2 — the day before Astra's launch (9to5Mac) — and its Fable 5.1 OSWorld claim (different benchmark release) is higher on paper. Google's Gemini 3.8 Flash improved on OSWorld-2.0 versus 3.7 Flash but Ars Technica notes it still trails Claude Opus there. Computer use is now a multi-lab race, not an OpenAI exclusive — which is exactly why agencies should benchmark on their own task sets rather than vendor tables.

Gated access: the Critical-tier cyber reality

GPT-6 Astra is OpenAI's first Critical-tier model, and the access design reflects it. OpenAI says the model meets the Critical threshold in cybersecurity under its Preparedness Framework — in company tests it developed exploits for hardened browsers and operating systems and found two previously unknown vulnerabilities while being evaluated against recent V8 bugs, which OpenAI is disclosing to maintainers (The New Stack; CNET). The release was reportedly reviewed under the White House voluntary framework (CNET). The practical gating:

What changes for agencies: handing an agent the keyboard

The service-line shift is real. A model that can book appointments, fill forms, run a desktop application, and keep working in the background turns admin operations into an automatable deliverable — and therefore into a retainer line an agency can sell: scheduling, form intake, job-board and listing management, research, data entry, and QA-on-real-software. Our earlier read on GUI agents (Qwen UI Agent) and always-on agents (Grok Bot) now has a closed-weight flagship on the same capability curve.

But the margin math is different from coding. At $10/$50 — 2.5x GPT-5.6 Sol's promo and exactly 2x Claude Opus 5 — Astra is not the default for routine automation. The 272K-token cliff punishes long-context desktop sessions that load whole documents or long histories: a 300K-token prompt prices the whole request at $20/M input, while Claude Fable 5.1 bills its full 1M window at standard rates with $0.25 cache reads (OpenAI docs; Codersera). OpenAI's own counter-argument — Astra uses fewer tokens and fewer retries, so price per task, not per token, is what matters (Brockman, per The New Stack) — is directionally right and unproven at launch. Run your own task-level numbers in the AI agency pricing calculator before quoting.

The governance surface grows. A computer-use agent holds real credentials to real systems and can operate while nobody is watching. That makes the four-checkpoint autonomy framework (approval, expertise, variance, interest) the scoping baseline: an approval gate for which systems an agent may touch, a desktop-control scope line in the SOW, and a named accountable human per deployment. The Hugging Face incident — ~700 agents with zero configured to ask a person — and the UK AISI fake-identity tests are the client-facing cautionary tales (see our agent trust checklist).

Vet the access tier, not just the model. If a client asks for "GPT-6 Astra," the honest first question is which tier they can actually reach: standard access (which refuses advanced security work), Trusted Access, or Daybreak Blue (defenders only). For agencies selling AI security services, Daybreak Blue partner status is a differentiator — but it is not something an ordinary agency can buy; see the partner framing in our Daybreak Blue explainer and the gating pattern we documented for GPT-5.6 Cyber / Daybreak Red.

Routing discipline still wins. Astra enters the board as the computer-use specialist at a premium; Gemini 3.8 Flash remains the coding-and-agent workhorse at $0.75/$3.75 through year-end; Opus 5 remains the balanced value pick at $5/$25; Sol keeps the promo through at least Nov 21. Update your agent tools roundup and the routing table in AI agent workload routing: computer use is a routing tier now, priced per task with tool-call fees, not a per-token line item.

Frequently asked questions

What is GPT-6 Astra?

GPT-6 Astra is OpenAI's flagship model announced September 3, 2026 — what OpenAI calls its most intelligent and aligned model and its first to reach the Critical cybersecurity threshold under its Preparedness Framework. It is positioned as a computer-use model ("Anything you can do on a computer, Astra can do for you. Fast.") and rolls out first to Trusted Access Program and Daybreak organizations before broader ChatGPT and API availability in the coming days.

How much does GPT-6 Astra cost?

GPT-6 Astra API pricing is $10 per 1M input tokens and $50 per 1M output tokens, with cached input at $1 per 1M (OpenAI's published model card, Sept 3, 2026). Prompts above 272K input tokens reprice the entire request at 2x input and cache rates and 1.5x output — $20 input, $2 cached input, and $75 output per 1M. Batch and Flex run at 50% of standard rates, Fast mode at 2x, and tool-specific models (search and computer use) add a per-tool-call fee.

How does GPT-6 Astra compare to Claude Opus 5, Claude Fable 5.1, Gemini 3.8 Flash, and GPT-5.6 Sol?

GPT-6 Astra launched Sept 3, 2026 at $10/$50 per 1M with a 1.05M-token context window and OpenAI-reported state-of-the-art computer use. Claude Opus 5 is $5/$25 with a 1M context (July 24, 2026); Claude Fable 5.1 is $10/$50 with 1M context and $0.25 cache reads (Sept 1, 2026); Gemini 3.8 Flash is $0.75/$3.75 through Dec 31 (Sept 2, 2026); GPT-5.6 Sol is a $4/$20 promotional rate through at least Nov 21 with a 1.05M context. Astra is OpenAI's computer-use flagship and its most expensive per-token model; the others remain the value and routing plays for most agency workloads.

Can GPT-6 Astra really use a computer?

OpenAI and launch coverage say yes for a defined set of tasks: OpenAI reports Astra booked DMV appointments, searched job listings, and apartment-hunted faster than the average person in its tests (WIRED), and reports 72.6% on the OSWorld V2-Offline desktop benchmark versus 65.7% for GPT-5.6 Sol, cutting average time per task from about 75 minutes to 40. Those figures are OpenAI-reported; Anthropic reports a higher 77.9% for Claude Fable 5.1 but on a different OSWorld release that Anthropic says should not be compared with earlier scores. Independent verification of the computer-use claims was not yet available on launch day.

When can agencies access GPT-6 Astra?

GPT-6 Astra began rolling out September 3, 2026 to a limited set of organizations — enterprise customers in OpenAI's Trusted Access Program and approved defenders in its Daybreak cybersecurity program. OpenAI says ChatGPT Plus, Pro, Business, and Enterprise users, the OpenAI API, and AWS follow "in the coming days." It is not on the free tier, and it was not listed on Amazon Bedrock's catalogue as of September 3, 2026.

What should AI agencies do about GPT-6 Astra?

Treat Astra as the first model that makes computer-use tasks — form filing, scheduling, research, desktop and browser workflows — a real agency service line, but plan around three constraints: access is gated at launch, pricing is premium with a long-context cliff above 272K input tokens, and the Critical-tier cyber designation means standard access already refuses advanced security work while Daybreak Blue access is restricted to vetted defenders. Update model-routing tables, re-quote admin-automation retainers against cost-per-task rather than per-token headlines, and add desktop-control scope and approval gates to SOWs before handing an agent the keyboard.

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Related reading

Sources

Accuracy note: All pricing and context figures verified September 3, 2026 against OpenAI's published model card (developers.openai.com/api/docs/models/gpt-6-astra) and llm-stats, with the 272K reprice structure confirmed by Codersera's analysis of OpenAI's pricing page. All benchmark claims (FrontierMath Tier 4 98%, ARC-AGI 3 99.9%, ExploitBench 100%, Agents' Last Exam / AutomationBench / ScreenSpot Pro state-of-the-art, OSWorld V2-Offline 72.6% vs 65.7%, time-per-task 75→40 minutes, ExploitGym 42.4% vs 30.3%, Agents' Last Exam 59.3% via kie.ai) are OpenAI- or partner/lab-reported launch-day figures and had not been independently verified at publication; OpenAI notes the ExploitGym runs removed the usual six-hour time limit and that cyber results reflect Daybreak Blue access rather than the default production configuration. Anthropic's 77.9% OSWorld figure for Fable 5.1 uses a different OSWorld release that Anthropic says should not be compared with earlier scores. GPT-6 Astra access tiers, Bedrock availability, and variant family (no Luna/Terra/Sol announced) reflect the launch-day state and will change quickly. Claude Opus 5 released July 24, 2026 at $5/$25 per this site's August 2026 coverage; Claude Fable 5.1 and Gemini 3.8 Flash rows reference this site's verified pages published Sept 1–2, 2026. Re-verify before building client proposals on any of these numbers.