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Claude Mythos 5 vs GPT-5.5 Pro — Premium AI Model Pricing
Mythos 5 delivers premium performance at 66% less cost. Compare two top-tier models: Anthropic's creative powerhouse vs OpenAI's maximum capability model.
Pricing data verified: Jun 28, 2026
All Premium Models Compared
Premium-tier AI models from major providers, ranked by input price.
| Model | Provider | Tier | Input (per 1M) | Output (per 1M) | Context |
|---|---|---|---|---|---|
| Claude Opus 4.8 | Anthropic | Premium | $5.00 | $25.00 | 1M |
| GPT-5.5 | OpenAI | Premium | $5.00 | $30.00 | 1.05M |
| Claude Mythos 5 | Anthropic | Premium | $10.00 | $50.00 | 1M |
| GPT-5.5 Pro | OpenAI | Premium | $30.00 | $180.00 | 1.05M |
| Gemini 3.1 Pro | Mid | $2.00 | $12.00 | 1M |
Calculate Your Exact Costs
Mythos 5 is 66-72% cheaper — see how much you save for your specific usage.
Which Should You Choose?
Creative Writing & Content
Blog posts, marketing copy, stories, creative content generation, brand voice.
Maximum Capability Tasks
Complex reasoning, research-grade analysis, cutting-edge problem solving.
Cost-Effective Premium
Premium quality output without premium-tier pricing.
OpenAI Ecosystem
Apps built on OpenAI APIs, existing OpenAI integrations, GPT plugins.
High-Volume Workloads
Chatbots, RAG pipelines, API-heavy applications with thousands of daily requests.
Enterprise Teams
Large team deployments, multi-department usage, budget-conscious enterprises.
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Frequently Asked Questions
Is Claude Mythos 5 or GPT-5.5 Pro cheaper?
Claude Mythos 5 is significantly cheaper: $10.00 input / $50.00 output per 1M tokens, compared to GPT-5.5 Pro at $30.00 input / $180.00 output per 1M tokens. That's 66% cheaper on input and 72% cheaper on output for Mythos 5.
What's the difference between Claude Mythos 5 and GPT-5.5 Pro?
Claude Mythos 5 ($10/$50) is an Anthropic premium model with a 1M token context window, focused on creative writing, narrative reasoning, and nuanced analysis. GPT-5.5 Pro ($30/$180) is an OpenAI premium model with a 1.05M context window, offering maximum capability within the OpenAI ecosystem. Mythos 5 is 66% cheaper on input and 72% cheaper on output.
Is GPT-5.5 Pro worth 3x the price of Claude Mythos 5?
GPT-5.5 Pro costs 3x more on input ($30 vs $10) and 3.6x more on output ($180 vs $50) than Mythos 5. GPT-5.5 Pro is worth it if you need OpenAI ecosystem integration, slightly more context (1.05M vs 1M), or specific GPT-5.5 Pro capabilities. For most use cases, Mythos 5 at a fraction of the cost delivers excellent results.
Which is better for coding: Claude Mythos 5 or GPT-5.5 Pro?
Both are premium-tier models with strong coding capabilities. GPT-5.5 Pro offers slightly more context (1.05M vs 1M) which can help with very large codebases. Mythos 5 is excellent for coding tasks at 66% lower input cost. For cost-effective coding at scale, Mythos 5 is the better value. GPT-5.5 Pro may edge ahead on specific complex reasoning tasks.
Should I use Claude Mythos 5 instead of GPT-5.5 Pro?
If cost is a primary concern, Mythos 5 is the clear winner at 66-72% less expensive than GPT-5.5 Pro. Choose Mythos 5 for creative work, cost-effective premium performance, and if you're open to the Anthropic ecosystem. Choose GPT-5.5 Pro if you're deeply invested in OpenAI's ecosystem, need the extra 50K context tokens, or require OpenAI-specific features.
Claude Mythos 5 vs GPT-5.5 Pro for enterprise?
For enterprise use, Mythos 5 at $10/$50 per 1M tokens offers substantial savings over GPT-5.5 Pro at $30/$180. At scale, the cost difference is dramatic — 1M requests/month with 2K input and 500 output tokens costs ~$350/month on Mythos 5 vs ~$1,200/month on GPT-5.5 Pro. Unless your enterprise requires OpenAI ecosystem integration, Mythos 5 provides premium capabilities at a fraction of the cost.
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