Claude Pricing in 2026: Opus 5, Sonnet 5 & Fable 5 Compared
Claude 4 is retired. Here's what replaced it — the current model lineup, real API rates, and which tier is actually worth paying for in August 2026.
ToolRadar Editorial · Verified against Anthropic's official pricing documentation, August 2026.
8.9/10 — Since this review first ran, Anthropic cut Opus output pricing by two-thirds, launched Sonnet 5 and Haiku 4.5, and added a brand-new tier above Opus called Fable 5.
None of that showed up on the page you're reading, which is why we're rewriting it. Below is the current picture: every model Anthropic sells through the API today, what each one costs per million tokens, how the consumer plans stack up, and which tier is actually worth paying for in August 2026.
What Happened to Claude 4?
Claude 4 Opus and Claude 4 Sonnet, the models this article originally reviewed, are retired for general use (Opus 4 remains accessible only through Google Cloud). Anthropic moved through several point releases — 4.1, 4.5, 4.6, 4.7, 4.8 — before settling on the current flagship, Claude Opus 5. Sonnet followed a similar path to Claude Sonnet 5, and Anthropic added an entry-level model, Haiku 4.5, plus two tiers above Opus: Claude Fable 5, generally available, and Claude Mythos 5, in limited availability through Anthropic's Project Glasswing. The single biggest change for anyone comparing prices: Opus output pricing fell from $75 per million tokens to $25 — a cut of two-thirds — while benchmark performance improved across the line.
The Current Model Lineup
Five Models, One API
Claude now ships as a ladder: Haiku 4.5 for cheap, fast tasks, Sonnet 5 for daily production work, Opus 5 for hard reasoning, and Fable 5 above that for the toughest jobs. Mythos 5 sits at the top but is limited to a small set of organizations under Project Glasswing rather than sold publicly.
1M-Token Context, Standard Pricing
Claude 4.6 and later models include a full 1-million-token context window at the same per-token rate as a short prompt — a 900K-token request costs the same per token as a 9K-token one. Older models max out at 200K.
Prompt Caching Discounts
A cache hit costs 10% of the standard input price. A 5-minute cache write costs 1.25x input; a 1-hour write costs 2x. For repeated system prompts or long documents queried multiple times, this is where most real-world savings come from — not the headline per-token rate.
Batch API and Fast Mode
The Batch API cuts both input and output pricing in half for non-time-sensitive jobs. At the other end, Fast Mode — in research preview for Opus 5 and Opus 4.8 — runs output up to 2.5x faster at a premium rate of $10/$50 per million tokens.
Claude API Pricing in 2026
| Model | Input (per 1M) | Output (per 1M) |
|---|---|---|
| Haiku 4.5 | $1.00 | $5.00 |
| Sonnet 5 (through Aug 31, 2026) | $2.00 | $10.00 |
| Opus 5 | $5.00 | $25.00 |
ToolRadar is not an Anthropic reseller and receives no commission on Claude subscriptions or API usage; pricing above is sourced directly from Anthropic's published documentation and subject to change.
Pros & Cons
✓ Where Claude 5 Delivers
- ✅ Opus pricing dropped two-thirds from the $75/million-token era to $25, with no benchmark regression — the same reasoning quality now costs less.
- ✅ The 1M-token context window on Claude 4.6+ models is billed at flat per-token rates, so long documents no longer carry a premium.
- ✅ Prompt caching (10% of input price on a hit) and the 50%-off Batch API mean realistic production costs sit well below the sticker price.
- ✅ Five tiers (Haiku, Sonnet, Opus, Fable, Mythos) let teams match spend to task difficulty instead of overpaying a single flagship rate for everything.
✗ Where It Still Hurts
- ❌ Fable 5, the new top public tier, costs $10/$50 per million tokens — more than Opus 5 — and its added value over Opus for most tasks isn't yet well documented outside Anthropic's own materials.
- ❌ Sonnet 5's introductory $2/$10 rate expires September 1, 2026 and rises to $3/$15, a 50% increase that teams budgeting past that date need to plan for now.
- ❌ No self-hosting or open weights at any tier — teams that need data sovereignty are still locked out of the entire Claude lineup, same as in the Claude 4 era.
Claude vs Kimi K2.6 vs Grok 4.5
| What Matters | Claude Opus 5 | Kimi K2.6 | Grok 4.5 |
|---|---|---|---|
| Output Price (per 1M) | $25.00 | ~$4.00 (open weights) | Not metered per-token; bundled into SuperGrok/API tiers |
| Context Window | 1M tokens (flat rate) | 256K tokens | 500K tokens |
| Self-Hosting | Not available | Full open weights | Not available |
How Steep Is the Learning Curve?
The comparison above understates how differently these three models are actually consumed: Kimi K2.6's open weights suit teams that want to self-host and tune infrastructure themselves, Grok 4.5 is mostly accessed through SuperGrok's flat monthly tiers rather than metered API calls, and Claude remains the only one of the three with a fully documented, per-model token rate card. For someone new to the Claude API specifically, the learning curve is shallow: the Messages API is a single endpoint, model selection is a string change, and prompt caching or batch mode are opt-in flags rather than architectural decisions. Picking the right model for a given task — knowing when Haiku is enough versus when a job genuinely needs Opus or Fable reasoning — is the part that takes longer to learn than the API itself, and it's where most of the avoidable spend in a Claude bill actually comes from.
Who Should Pay for Which Tier
Claude Opus 5 or Fable 5 is worth it if: You're running production agents, legacy-code migrations, or compliance-sensitive analysis where a wrong answer is expensive, and you want the 1M-token context window billed at standard per-token rates.
Look elsewhere if: Your workload is high-volume and cost-sensitive with tasks simple enough for Haiku 4.5 or an open-weight model like Kimi K2.6, or you need self-hosted, data-sovereign inference — Claude offers neither at any tier.
Expert Editorial Opinion
The headline number worth remembering is the two-thirds cut: Opus output pricing held at $75 per million tokens for the Opus 4.1 generation and has sat at $25 through every release since, including the current Opus 5. That's not a temporary promotion — Anthropic has shipped four flagship refreshes at the lower rate without reversing it.
Sonnet 5 is the tier most teams will default to. Its introductory $2/$10 per-million-token rate runs through August 31, 2026, after which it rises to $3/$15 — the same standard rate Sonnet has carried across its last few generations. Budget for the higher number if a project extends past that date.
Haiku 4.5 remains the cheapest way into the current model family at $1/$5 per million tokens, and it's the right default for high-volume, low-complexity work — classification, short summarization, simple extraction — where Sonnet or Opus would be paying premium rates for headroom that never gets used.
The real pricing gap in the current lineup sits at the top. Fable 5, the new generally-available tier above Opus, costs $10/$50 per million tokens — double Opus 5's rate — while Mythos 5 at the same price point is limited to a small set of organizations through Project Glasswing and isn't broadly purchasable yet. For most teams evaluating Claude today, the real decision is between three tiers, not five: Haiku for volume, Sonnet for daily work, Opus for hard problems, with Fable as a narrow option once its specific advantages over Opus are better documented outside Anthropic's own materials.
Is any of this worth paying for without a meaningful free tier? Claude.ai's free plan gives roughly 30 to 100 messages a day on Sonnet and Haiku, enough to evaluate quality but not enough for real work. Once a task needs consistent daily use, the honest comparison isn't Claude versus free — it's Claude Pro at $20 a month versus a competitor's equivalent tier, and on that basis the 1M-token context window and the prompt-caching discounts are what tip the value case, not the sticker price of Opus alone.
Final Verdict
Claude 4 Opus at $75 per million output tokens was a legitimate objection in mid-2026; Claude Opus 5 at $25 is a different conversation. The model lineup is wider, the context window pricing is flatter, and the caching and batch discounts do meaningful work if a team actually uses them. The open question isn't whether Claude is worth paying for — it's whether Fable 5's premium over Opus is worth paying for, and that's a harder case to make until Anthropic publishes more on what the extra tier actually buys.
Technical Quality: 9.2/10 · Price-to-Value: 8.5/10 · Documentation Maturity: 9.0/10
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❓ Frequently Asked Questions
Still budgeting for $75-per-million-token Opus?
That rate hasn't existed since the Opus 4.1 generation. Recalculate your Claude costs against the current $25 Opus 5 rate before you rule it out on price.
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