# Claude 4 Opus API Rate Limits, Pricing & Performance (July 2026)

- Tool: AI API Limits & Performance Matrix
- Last updated: July 2026

## TL;DR

The original Claude 4 Opus API string (claude-opus-4) stopped accepting requests on June 15, 2026. The active successor is Claude Opus 4.8 (claude-opus-4-8), Anthropic's current premium flagship with 1M token context and no long-context surcharge. Start tier allows ~50 RPM; Scale tier reaches ~4,000 RPM / ~2M ITPM. Pricing: $5.00 input / $25.00 output per MTok; cache reads $0.50/MTok.

## Frequently asked questions

### Is claude-opus-4 still working?

No. The claude-opus-4 API string stopped accepting requests on June 15, 2026. Any calls using that model string will fail. You must migrate to claude-opus-4-8, which is Anthropic's current premium flagship and the GA successor since May 28, 2026.

### How do I increase Claude Opus 4.8 rate limits?

Rate limits increase automatically: ~$40 cumulative spend moves you to Build, ~$200 cumulative unlocks Scale (~4,000 RPM / ~2M ITPM per third-party trackers). Above Scale, contact Anthropic sales for Custom tier with negotiated limits and no spend cap. Monitor at platform.claude.com/settings/limits or query GET /v1/rate-limits programmatically.

### What is the difference between Claude 4 Opus and Claude Opus 4.8?

Claude 4 Opus (claude-opus-4) was an earlier snapshot that stopped serving June 15, 2026. Claude Opus 4.8 (claude-opus-4-8) is the current GA model in the same Opus 4.x family, released May 28, 2026. They are in the same org-level pool and Opus 4.x limits apply to both. Use claude-opus-4-8 for all new work.

### Is the Claude Opus 4.8 API free?

No. There is no free tier for Claude Opus 4.8. All token usage is billed from the Start tier onward. Standard pricing is $5.00 input / $25.00 output per MTok. Batch API offers 50% off ($2.50/$12.50), and cache reads are $0.50/MTok.

### How does Claude Opus 4.8 compare to GPT-5 pricing?

Claude Opus 4.8 is $5.00/$25.00 per MTok vs GPT-5.5 at approximately $5.00/$30.00. Opus 4.8 has a meaningful output cost advantage ($25 vs $30 per MTok) and no long-context surcharge on 1M context, while GPT-5.5 charges 2× above 272K tokens. GPT-5.5 offers a much higher OTPM ceiling (~30M at Tier 5 vs ~800K for Opus at Scale), making it better suited for throughput-critical workloads.

### What causes Claude API 429 errors on Opus?

The 429 rate_limit_error on Opus 4.8 means you exceeded RPM, ITPM, or OTPM limits. Large 1M-context prompts are the most common ITPM trigger. The fix: activate prompt caching (cache reads excluded from ITPM), reduce max_tokens, or route batch work to Batch API. Check anthropic-ratelimit-tokens-remaining and anthropic-ratelimit-requests-remaining headers to identify which limit you hit.

### Does Claude Opus 4.8 support Priority Tier for lower latency?

Yes. Unlike Claude Sonnet 5 (which is NOT on Priority Tier), Claude Opus 4.8 supports Priority Tier access. Check with Anthropic sales when negotiating a Custom tier agreement if low-latency priority routing is a requirement for your use case.

### How can I reduce Claude Opus API costs for high-volume workloads?

The top levers: (1) Prompt caching — cache reads cost $0.50/MTok vs $5.00 standard and are excluded from ITPM. (2) Batch API — 50% off at $2.50/$12.50 for async jobs. (3) Model routing — use Haiku 4.5 ($1/$5) or Sonnet 5 ($2/$10) for classification/routing and escalate to Opus 4.8 only for tasks requiring deep reasoning. RapidDev's engineers specialize in multi-tier Anthropic model routing strategies — reach out at rapidevelopers.com/contact for a free scoping call.

### What is Fast Mode for Claude Opus 4.8?

Fast Mode is a high-speed inference option for Claude Opus 4.8 priced at $10.00 input / $50.00 output per MTok — 2× standard price. It has its own separate rate limit pool tracked via anthropic-fast-* headers. Reserve Fast Mode only for latency-critical user-facing paths where response time directly impacts UX; route all background and batch work through standard mode.

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Source: https://www.rapidevelopers.com/ai-api-limits-performance-matrix/claude-4-opus
© RapidDev — https://www.rapidevelopers.com/ai-api-limits-performance-matrix/claude-4-opus