Claude Opus vs GPT-5 Pro in 2026: Features, Pricing and Use Cases
Claude Opus (via Claude Pro at $17/month billed annually, or $20 monthly) is the cheaper way to get a frontier flagship model, with Opus 5.5 API rates at $4 per million input tokens and $20 per million output tokens. GPT-5 Pro access through OpenAI's Pro plans starts at $100/month, though OpenAI's Business plan undercuts at $20/seat/month for everyday work. For small businesses, Claude Pro's entry price is the lower-risk starting point, while OpenAI's Pro tier buys 5x-class usage for heavier workloads.
TL;DR
- Claude Opus 5.5 is available on Claude Pro ($17/month annually, $20 monthly), Max (from $100/month), Team and Enterprise plans — but not the Free plan.
- Opus 5.5 API pricing is $4 per million input tokens and $20 per million output tokens, a 20% cut from Opus 5, with cache reads down 60% to $0.20.
- OpenAI's Pro plans run $100, $200, or $500 per month, with Ultrafast mode access on the $500 tier; Pro plans currently have no five-hour limit.
- OpenAI's Business seat costs $20/month billed annually ($25 monthly) with SAML SSO, MFA, and no training on business data by default.
- Claude Opus 5.5 offers a 1,000,000-token context window and 128,000-token max output on the standard API.
- Claude's Free plan includes Sonnet and Haiku only; OpenAI's Free tier offers GPT-6 Luna at Standard speed for quick coding tasks.
- Anthropic estimates typical enterprise usage at about $13 per developer per active day, with under $30 covering 90% of users.
Head to head
| Dimension | GPT-5 Pro | Claude Opus |
|---|---|---|
| Pricing | Pro plans $100-$500/mo; Business seat $20/mo (annual) or $25/mo | Pro from $17/mo (annual) or $20/mo; Max from $100/mo; Team $20/seat/mo 🏆 |
| Ease of use | Desktop, web, mobile; Codex on web, CLI, IDE, iOS | Web, desktop, mobile apps; Claude in Chrome and Microsoft 365 on Pro+ |
| Features | Codex, workspace agents, Ultrafast mode (Pro $500), automatic code review | 1M-token context, Claude Code, Skills, connectors, memory, Projects, Research |
| Support | Priority request processing at Enterprise; sales contact for Enterprise & Edu | Priority access at high traffic on Max; sales-assisted Enterprise |
| Integrations | Google Workspace, Slack, GitHub, Microsoft 365 and more 🏆 | Chrome, Microsoft 365, Outlook, connectors, enterprise search (Enterprise) |
| Setup | Self-serve Business from 2 users; Enterprise via sales 🏆 | Self-serve from Free/Pro; Enterprise requires 20-seat minimum |
| Admin & security | SAML SSO, MFA, centralized billing, spend controls at $20/seat Business 🏆 | SSO, audit logs, SCIM, RBAC only at Enterprise (20 seats min) |
| API economics | GPT-6 Astra: $10 in / $50 out per MTok; Luna $0.10/$0.50 | Opus 5.5: $4 in / $20 out per MTok; cache read $0.20 |
The contenders
Claude Opus is Anthropic's flagship model line, with the latest release (Opus 5.5, launched September 22, 2026) positioned for agentic coding, computer use, and knowledge work. Anthropic says the model costs about 40% less on typical workloads and runs over 30% faster than Opus 5. It features a 1,000,000-token context window and 128,000-token max output, with adaptive thinking always on (depth controlled via an effort parameter). Opus is available through Anthropic's API, Amazon Bedrock, Google Cloud Vertex AI, and Microsoft Foundry, plus the Claude Pro, Max, Team, and Enterprise subscription plans. Pro subscribers also get Claude Code, Claude in Chrome, Microsoft 365 integration, Projects, Research, and Skills — the SKILL.md instruction packages that extend agent capabilities.
pricing 17/month
- + Lowest-cost entry to a flagship model: Opus is on the $17-20/month Pro plan
- + Opus 5.5 API prices cut 20% versus Opus 5, with cache reads down 60% to $0.20 per MTok
- + 1M-token context window — the largest tier Anthropic offers across plans
- + Claude Code, Skills, and connectors included from the Pro tier
- + No model training on your content by default (opt-out available)
- + Anthropic estimates typical enterprise usage at ~$13 per developer per active day
- − Free plan excludes Opus entirely (Sonnet and Haiku only)
- − Adaptive thinking can't be turned off — high effort adds roughly 20,000 thinking tokens (~$0.40) per task
- − Output tokens cost 5x input ($20 vs $4 per MTok), so long generations get expensive
- − SSO, audit logs, and admin controls are Enterprise-only — Team and below lack them
- − Fast mode doubles both API rates ($8 input / $40 output per MTok)
GPT-5 Pro is OpenAI's premium-tier access path to its most capable models, delivered through the Pro subscription plans and the Business/Enterprise workspace lineup. Pro plans run $100, $200, or $500 per month and include Codex across web, CLI, IDE, and iOS, cloud-based integrations like automatic code review and Slack, and Ultrafast mode access on the $500 tier. Business workspaces ($20/seat/month annually) add a secure environment with company context, SAML SSO, MFA, centralized billing, usage analytics, spend controls, and workspace agents for customized workflows. OpenAI's model lineup spans GPT-6 Astra ($10/$50 per MTok standard) down to GPT-6 Luna ($0.10/$0.50), with Fast and Ultrafast speed modes consuming included limits at 2.5x-8x rates. Pro plans currently have no five-hour usage limit.
pricing 20/month
- + Business seat at $20/month (annual) includes SAML SSO, MFA, and admin controls — governance features Claude reserves for Enterprise
- + Pro plans ($100-$500/month) have no five-hour usage limit
- + Broad model range: GPT-6 Luna at $0.10/$0.50 per MTok for cheap high-volume work
- + Mix and match standard and premium seat types in one Business workspace
- + Workspace agents and deep integrations with Slack, GitHub, Google Workspace, Microsoft 365
- + Priority request processing and enterprise controls (SCIM, RBAC, audit logs) at Enterprise tier
- − Pro plans start at $100/month — 5x Claude Pro's entry price for individual flagship access
- − Flagship GPT-6 Astra API costs $10/$50 per MTok standard — 2.5x Opus 5.5's rates
- − Ultrafast mode consumes included usage at 8x the Standard rate for Astra and Sol
- − GPT-5.5 retires from Codex with ChatGPT sign-in on October 14, 2026, forcing migrations
- − Regional processing (data residency) endpoints carry a 10% price uplift for newer models
Verdict
Winner: Claude Opus
Claude Opus is reachable at a much lower entry price ($17-20/month Pro plan) and its latest API rates ($4/$20 per MTok) undercut OpenAI's flagship API tiers. OpenAI's Pro plans ($100-$500/month) target heavier users, but its $20 Business seat is competitive for teams.
| Option | Overall | Breakdown |
|---|---|---|
| Claude Opus | 8 | : 9: 8: 8: 7 |
| GPT-5 Pro | 7 | : 6: 8: 8: 7 |
Pricing compared
Features and capability compared
Small-business fit compared
Which should you pick?
- :
- :
- :
- :
- :
- :
FAQ
Is Claude Opus available on the free plan?
No. Claude's Free plan is limited to Sonnet and Haiku-tier models. The cheapest way to get Opus is the Pro plan at $17/month with annual billing ($200 up front) or $20/month billed monthly. Max plans from $100/month add 5x-20x more usage plus monthly API credits.
How much do OpenAI's Pro plans cost?
OpenAI's Pro plans run $100, $200, or $500 per month. All include everything in Plus plus Codex access, and the $500 tier adds Ultrafast mode. Pro plans currently have no five-hour usage limit, unlike Plus and Standard Business seats which are capped per five-hour window.
Which is cheaper for API usage?
For flagship models, Claude Opus 5.5 at $4/$20 per million tokens is 2.5x cheaper than OpenAI's GPT-6 Astra at $10/$50. But OpenAI's GPT-6 Luna at $0.10/$0.50 per MTok is far cheaper than any Claude model for high-volume commodity tasks. Cache economics also favor Claude: Opus 5.5 cache reads dropped 60% to $0.20 per MTok.
Can small businesses get SSO without an enterprise contract?
With OpenAI yes — the Business plan at $20/seat/month (annual) includes SAML SSO, MFA, and centralized administration for teams of 2-200. With Claude, SSO, audit logs, SCIM, and role-based access only come with the Enterprise plan, which has a 20-seat minimum at $20/seat/month billed annually.
What are agent skills and do they work with both?
Agent skills are SKILL.md instruction packages that extend what coding and chat agents can do. Claude supports Skills natively across all plans including Free. Since published research found roughly 26% of skills carry at least one vulnerability, SkillzBench (currently in pre-launch) is building a free directory and MCP tool that pins versions, security-scans, and benchmarks skills so you can see the measured Lift before equipping any agent.