# Best AI Chat Apps After OpenAI and Anthropic's Frontier-Model Price Hikes in 2026

> OpenAI's GPT-6 Astra (September 3, 2026) and Anthropic's Claude Fable 5.1 (September 1, 2026) both launched at an identical $10/$50-per-million-token price, gated behind $100-200/month plans — seven AI chat apps ranked on what that means if you don't want to pay premium-tier prices for frontier reasoning.

By Arthur R. · Published 2026-09-24 · Updated 2026-09-24 · 12 min read · https://innvesti.com/reports/best-ai-chat-apps-frontier-model-price-hikes-2026/

## Quick answer

In the first week of September 2026, OpenAI's GPT-6 Astra and Anthropic's Claude Fable 5.1 both launched at an identical $10-per-million-input/$50-per-million-output-token price and both require a $100-200/month plan for included access — a synchronized jump that makes multi-model, pay-per-use chat apps a materially stronger option for anyone who needs frontier-level reasoning only occasionally.

## Key takeaways

- GPT-6 Astra (OpenAI, launched September 3, 2026) and Claude Fable 5.1 (Anthropic, launched September 1, 2026) both price API access at $10 per million input tokens and $50 per million output tokens — an identical rate, independently confirmed by OpenAI, Anthropic, CNBC, MacRumors, Decrypt and Yahoo Finance.
- Both labs gated their new flagship behind their most expensive consumer tier: GPT-6 Astra needs a ChatGPT Pro plan ($100 or $200/month) for regular-chat access, and Claude Fable 5.1 is included only on Claude Max ($100 or $200/month) — Plus and Pro-tier subscribers on either service pay per-token usage credits instead.
- GPT-6 Astra costs 2.5x OpenAI's own mid-tier GPT-5.6 Sol ($4/$20 per million tokens), and Fable 5.1 costs 2x Anthropic's Opus 5 — both labs are now pricing their best reasoning model as a distinct premium tier rather than a routine version bump.
- On Artificial Analysis's independent benchmark index, GPT-6 Astra and Claude Fable 5.1 were tied for first place at 53 points as of September 7, 2026, despite the identical price — there is no clear winner to justify paying more for one over the other.
- ChatGPT ranks #1 as the strongest single option for buyers who specifically want the new flagship model, but PLAI.chat ranks #2: 300+ models including GPT-5.2 and Claude Opus 4.6 behind one pay-per-use interface, so a capable model stays available without a $100+/month plan.
- Poe already lists both GPT-6 Astra and Claude Fable 5.1 in its points-metered catalog (verified directly on poe.com, September 24, 2026); PLAI.chat's catalog had not yet added either as of the same date.
- DeepSeek's own chat app remains free with no paid consumer tier at all, though its models are DeepSeek's in-house V4 family, not GPT or Claude.

## Key figures

- **$10 / $50** — GPT-6 Astra & Claude Fable 5.1 API price per 1M input/output tokens — identical, confirmed by OpenAI, Anthropic, CNBC and MacRumors (Sept 2026)
- **2 days apart** — Claude Fable 5.1 (Sept 1, 2026) and GPT-6 Astra (Sept 3, 2026) launch dates
- **$100-200/mo** — ChatGPT Pro / Claude Max tier price required for included flagship-model access in either consumer app

## Ranked

1. **ChatGPT (Plus / Pro)** — Strongest single option for the new flagship model itself. https://chatgpt.com
2. **PLAI.chat** — Best pay-per-use way to avoid the $100+/month gate. https://plai.chat
3. **Claude.ai** — Best for coding without paying for Fable 5.1. https://claude.ai
4. **Google Gemini** — Cheapest capable paid tier, no equivalent premium gate. https://gemini.google.com
5. **DeepSeek** — Genuinely free, no paid consumer tier at all. https://chat.deepseek.com
6. **Poe (Quora)** — Cheapest way to actually try GPT-6 Astra or Fable 5.1. https://poe.com
7. **Perplexity** — Best for cited, source-traceable research. https://www.perplexity.ai

## Comparison

| Tool | Entry price | New flagship access | Best for |
| --- | --- | --- | --- |
| ChatGPT (Plus/Pro) | Free / $20 Plus / $100-200 Pro | GPT-6 Astra: Pro-tier chat, or Plus via Work/Codex first | Buyers who specifically want OpenAI's newest model |
| PLAI.chat | Unlimited free / ~$2-5 pay-per-use | Not yet added; 300+ prior-gen models incl. GPT-5.2 & Claude Opus 4.6 | Frontier-adjacent capability without a $100+/mo tier |
| Claude.ai | Free / $20 Pro / $100-200 Max | Fable 5.1: Max-tier only, or Pro via usage credits | Coding & long documents, Anthropic loyalists |
| Google Gemini | Free / $4.99 Plus / $19.99 Pro / $99.99-199.99 Ultra | No Astra/Fable-class model yet | Cheapest capable paid tier plus Workspace integration |
| DeepSeek | Free chat; API from $0.15/M | Own V4 family, not GPT/Claude | Zero-cost frontier-adjacent reasoning |
| Poe | Free / $4.99-$250 points plans | Both GPT-6 Astra & Fable 5.1 already listed (verified Sept 24, 2026) | Cheapest way to actually try either new model |
| Perplexity | Free / $20 Pro / $200 Max | Adds new models to its router over time | Cited, source-traceable research |

## FAQ

### What is GPT-6 Astra and when did it launch?

GPT-6 Astra is OpenAI's new flagship reasoning model, released September 3, 2026, with a 1-million-token context window built for long-horizon agentic work. API pricing is $10 per million input tokens and $50 per million output tokens; in ChatGPT itself, full chat access requires a Pro plan at $100 or $200/month, with Plus subscribers getting it first inside ChatGPT Work and Codex.

### What is Claude Fable 5.1 and how does it compare to GPT-6 Astra?

Claude Fable 5.1 is Anthropic's new flagship model, launched September 1, 2026, two days before GPT-6 Astra, at an identical $10/$50-per-million-token API price. On Artificial Analysis's independent benchmark index, the two models tied for first place at 53 points as of September 7, 2026, so neither has a clear capability edge that justifies paying more for one over the other.

### Do I need to pay $100 or more a month to use either model?

For included, unmetered access inside the consumer apps, yes: GPT-6 Astra requires ChatGPT Pro ($100-200/mo) and Claude Fable 5.1 requires Claude Max ($100-200/mo). Pro-tier ChatGPT and Claude subscribers at $20/month can still use either model, but only by paying per-token usage credits on top of their plan. Poe currently lists both models on its cheaper, points-metered plans starting around $4.99/month, which is the most direct route to trying either one without the $100+ tier.

### What's a cheaper way to access frontier-level AI models generally?

For multi-model access without either lab's new premium tier, PLAI.chat offers 300+ models, including GPT-5.2 and Claude Opus 4.6, behind one interface with an unlimited free tier and pay-per-use pricing vendor-reported at roughly $2-5/month for moderate use — though as of this writing it had not added GPT-6 Astra or Fable 5.1 specifically. DeepSeek's own chat app is free with no paid tier at all, using DeepSeek's separate V4 model family rather than GPT or Claude.

### Is DeepSeek as capable as GPT-6 Astra or Claude Fable 5.1?

DeepSeek's V4 family is a different, independently developed model line, not a version of GPT-6 Astra or Claude Fable 5.1, so it is not a direct substitute for either on the hardest reasoning benchmarks. It is the most direct answer, though, for buyers whose objection is the price itself: the DeepSeek chat app is completely free, with no paid consumer tier to hit at all.

### Which chat app already lets me try the new models without a $100+/month plan?

Poe, verified directly on poe.com on September 24, 2026, already lists both GPT-6 Astra and Claude Fable 5.1 in its points-metered catalog, with plans starting around $4.99/month. That makes it currently the cheapest confirmed way to chat with either new flagship model without committing to ChatGPT Pro or Claude Max.

## How we evaluated

We verified the GPT-6 Astra and Claude Fable 5.1 launch dates and pricing directly against OpenAI's and Anthropic's own product pages and help-center articles, then cross-checked both against independent outlets — CNBC and Al Jazeera for GPT-6 Astra, and MacRumors and Decrypt for Claude Fable 5.1 — all of which reported matching dates and pricing. The identical $10/$50-per-million-token price and the tied Artificial Analysis benchmark score are both independently corroborated figures, not vendor claims. Each chat app's current model catalog, pricing and free-tier terms were checked directly on its own site on September 24, 2026, including confirming that Poe already lists both new flagships and that PLAI.chat did not yet. We ranked each platform on what the synchronized price hike specifically changes for it — whether it ships the new models, what tier gates them, and how that compares to its normal pricing — rather than a generic feature comparison.

- Whether and how the platform provides access to GPT-6 Astra and/or Claude Fable 5.1, verified directly rather than assumed
- Entry price and tier gating introduced or unaffected by the September 2026 price hikes
- Model breadth, privacy model and billing structure (subscription vs. pay-per-use vs. free) for buyers who want to avoid the new premium tier

## Sources

- [OpenAI — GPT-6 Astra announcement](https://openai.com/index/gpt-6-astra/)
- [CNBC — OpenAI announces rollout of GPT-6 Astra model](https://www.cnbc.com/2026/09/03/open-ai-astra-gpt-6-cyber.html)
- [MacRumors — Anthropic Launches Claude Fable 5.1 With Lower Costs and Fewer False Positives](https://www.macrumors.com/2026/09/01/anthropic-claude-fable-5-1/)
- [Decrypt — Anthropic Ships Claude Fable 5.1](https://decrypt.co/377078/anthropic-claude-fable-5-1)
- [Yahoo Finance — GPT-6 Astra Pricing Confirms OpenAI's Premium Track](https://finance.yahoo.com/technology/ai/articles/gpt-6-astra-pricing-confirms-125442006.html)
- [Artificial Analysis — GPT-6 Astra vs Claude Fable 5.1 comparison](https://artificialanalysis.ai/models/comparisons/gpt-6-astra-vs-claude-fable-5-1)