Premium models are not the default lane. They are escalation tools for work where a better answer is worth more than the API bill.
The current ladder: use Sonnet 5 for daily production, Opus 4.8 for most premium Claude work, and GPT-5.5 when OpenAI economics or tooling fit better. Keep GPT-5.6 on the restricted-preview watchlist. Fable 5 is globally restored but remains an expensive guarded escalation; Mythos 5 remains trusted-access only.
For the dated return analysis, read /posts/fable-5-returns-claude-sonnet-5/. For the deeper Fable-specific buying guide, read /posts/claude-fable-5-mythos-5-cost-guardrails/.
Quick Comparison
Prices are per 1 million tokens.
| Model | Input | Output | Batch input/output | Context | Best use |
|---|---|---|---|---|---|
| Claude Fable 5 | $10 | $50 | $5 / $25 | 1M | Restored premium escalation; not a default lane |
| GPT-5.6 Sol | $5 | $30 | not published | preview lane | Restricted preview; keep GPT-5.5 active |
| GPT-5.6 Terra | $2.50 | $15 | not published | preview lane | Restricted preview; not a live value route |
| GPT-5.6 Luna | $1 | $6 | not published | preview lane | Restricted preview; not a live value route |
| Claude Opus 4.8 | $5 | $25 | $2.50 / $12.50 | 1M | Practical premium Claude baseline |
| Claude Sonnet 5 | $2 intro; $3 standard | $10 intro; $15 standard | verify current pricing docs | 1M | First Claude cost/performance test; intro ends Aug 31 |
| GPT-5.5 standard, short context | $5 | $30 | $2.50 / $15 | short-context lane | OpenAI-native premium work |
| GPT-5.5 standard, long context | $10 | $45 | $5 / $22.50 | long-context lane | Long context when OpenAI fit matters |
| GPT-5.5 Pro, short context | $30 | $180 | $15 / $90 | short-context Pro lane | Highest-cost OpenAI Pro-tier work |
Model Notes
Claude Fable 5
Anthropic suspended Fable on June 12 and says the export controls were lifted June 30. Fable returned globally on native Claude surfaces July 1, while cloud re-enablement remains in progress. It costs 2x Opus 4.8, 5x Sonnet 5 at the introductory rate, and about 3.3x Sonnet 5 at the standard rate. Treat it as a high-cost guarded escalation, not a default lane.
If your account has access, re-test it only for long-horizon autonomous coding, vision-heavy reconstruction, scientific or analytical work, and expensive decisions where Opus is visibly not enough. Avoid it when zero-data-retention terms are required, when cyber/bio/chem fallback would break the workflow, or when you need predictable low-cost scale.
Claude Opus 4.8
Opus remains the practical premium Claude baseline. It costs half as much as Fable, has the same 1M-class context pricing shape in current Claude docs, and is the model to try before escalating to Fable.
Use Opus for architecture, hard debugging, code review, multi-file reasoning, and second-pass arbitration. See the current baseline guide: /models/claude-opus-4-8/.
The value comparison against GLM-5.2 is intentionally conservative: GLM-5.2 API is about 72% lower on input and 82.4% lower on output than Opus 4.8 API list pricing. That makes GLM-5.2 a value lane to test, not a proven Opus replacement.
Claude Sonnet 5
Sonnet 5 is the default Claude production test. Its $2/$10 introductory API rate runs through August 31, 2026, then becomes $3/$15. The new tokenizer can produce about 30% more tokens for equivalent text, so compare complete request and agent-loop cost rather than list price alone.
Move up only when Sonnet fails in a way that matters.
GPT-5.5
GPT-5.5 standard short-context pricing is cheaper than Fable on input and output. Long-context standard pricing matches Fable input and is lower on output. GPT-5.5 Pro is much more expensive than Fable.
Compare GPT-5.5 when cached-input economics, Codex/OpenAI tooling, OpenAI-native APIs, or long-context behavior matter more than Claude’s model behavior.
GPT-5.6 watchlist
OpenAI lists Sol, Terra, and Luna at $5/$30, $2.50/$15, and $1/$6 per million input/output tokens, but all three are in a select trusted-partner preview through the API and Codex. Listed pricing is not general availability. Keep GPT-5.5 as the active OpenAI baseline until your account can call GPT-5.6 and its retention, safeguard, and fallback terms pass review. The Sol limited-preview investigation covers the system card’s destructive-action, credential, and fabricated-completion warnings; the frontier access-gates analysis covers the broader policy distinction.
Use the consolidated GPT-5.6 model guide for family pricing, cache behavior, status, and benchmark provenance.
Comparable Evidence
benchmark artifact
Premium and Restricted Model Evidence
| Model | Provider | Status | Context | Input price | Output price | Coding signal | Tool-use signal | Benchmark evidence | Speed | Verdict | Sources | Checked |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| GPT-5.5 | OpenAI | active Generally available OpenAI baseline while GPT-5.6 remains in limited preview. | 1.05M API; 400K Codex | $5.00 / 1M | $30.00 / 1M | not verified | not verified | not verified | not verified | Primary coding seat while ChatGPT/Codex limits fit the workload. | OpenAI GPT-5.5 API model page, OpenAI GPT-5.5 ChatGPT limits, Artificial Analysis: GPT-5.5, LMArena leaderboard dataset | 2026-06-28 |
| GPT-5.6 Sol | OpenAI | preview Selected API organizations and Codex workspaces only; no public enrollment and no ChatGPT access during preview. | not published | $5.00 / 1M | $30.00 / 1M | OpenAI reports a new state of the art on Terminal-Bench 2.1; expanded and independent results are pending. | API and Codex preview; max reasoning and ultra multi-agent modes are vendor-documented. |
| OpenAI announced a selected-customer Cerebras preview for July; production latency is not verified. | Restricted-preview evaluation only; keep GPT-5.5 as the active OpenAI baseline. | OpenAI GPT-5.6 launch [archive], OpenAI GPT-5.6 preview access [archive], OpenAI GPT-5.6 Preview system card [archive] | 2026-06-28 |
| Claude Sonnet 5 | Anthropic | active Generally available across Claude plans, Claude Code, the Claude API, GitHub Copilot, and supported AWS paths. | 1M | $2.00 / 1M | $10.00 / 1M | Anthropic reports substantial coding and agentic gains over Sonnet 4.6; independent normalized results are pending. | Available in Claude Code and the Claude API; adaptive thinking is on by default. |
| No site-owned normalized latency result is verified. | First Claude cost/performance test before Opus API pricing; retain Opus for highest-accuracy arbitration. | Anthropic Claude Sonnet 5 launch [archive], Claude Sonnet 5 migration guide [archive], GitHub Copilot Claude Sonnet 5 launch [archive], Claude Sonnet 5 on AWS [archive] | 2026-07-01 |
| Claude Opus 4.8 | Anthropic | active Current generally available Opus-tier premium baseline. | 1M | $5.00 / 1M | $25.00 / 1M | Practical premium Claude baseline; AIHackers recommends task-level comparison rather than blanket default routing. | Claude API and Claude-native workflow baseline; third-party routing must follow Anthropic terms. |
| Artificial Analysis measured 57.3 output tokens/s; provider and workload latency vary. | Premium review, architecture, hard-debugging, and final-arbitration lane. | Claude models overview [archive], Claude API pricing [archive], Artificial Analysis: Claude Opus 4.8 [archive], Artificial Analysis Intelligence Index v4.1, LMArena leaderboard dataset, Berkeley Function Calling Leaderboard | 2026-07-18 |
| Claude Fable 5 | Anthropic | active Restored globally on native Claude surfaces July 1; included usage is plan-specific and cloud re-enablement is rolling out. | 1M | $10.00 / 1M | $50.00 / 1M | Anthropic reports frontier launch results; independent reproducible ranking is pending. | Guarded-domain requests can refuse or fall back; verify account behavior before routing. |
| not verified | High-cost guarded escalation only; use Opus 4.8 as the practical Claude premium baseline. | Claude models overview [archive], Claude API pricing [archive], Anthropic Fable 5 and Mythos 5 [archive], Anthropic Fable/Mythos access statement [archive], Anthropic Fable 5 redeployment [archive] | 2026-07-01 |
| Claude Mythos 5 | Anthropic | restricted Restored to a set of approved US organizations; broader Glasswing access remains restricted. | 1M | $10.00 / 1M | $50.00 / 1M | General coding quality is not independently verified for an accessible production route. | Invitation-only research access; account and compliance approval required. |
| not verified | Restricted research context, not a normal production or buying recommendation. | Claude models overview [archive], Claude API pricing [archive], Anthropic Fable 5 and Mythos 5 [archive], Anthropic Fable/Mythos access statement [archive], Anthropic Fable 5 redeployment [archive] | 2026-07-01 |
Active, restored, preview, and restricted models are intentionally shown together with explicit status. Scores are not normalized across different benchmark families.
Decision Matrix
| If you need… | Start with | Escalate to |
|---|---|---|
| Routine production coding | Sonnet 5 | Opus 4.8 if architecture or multi-file reasoning fails |
| Premium Claude code review | Opus 4.8 | GPT-5.5 or another live lane; Fable only after access, compliance, and guardrail tests pass |
| Long-horizon autonomous coding | Opus 4.8 | GPT-5.5, Kimi, MiniMax, or GLM depending on tool fit |
| Vision-heavy reconstruction | Opus 4.8 | GPT-5.5 or Gemini if the live output is better |
| OpenAI-native workflow | GPT-5.5 standard | GPT-5.5 Pro only if the Pro behavior is worth the bill |
| Cyber, bio, or chemistry work | Do a guardrail test first | Trusted access or another approved model |
| Zero-data-retention workload | Avoid Fable/Mythos-class routes | Use a model/contract that meets the requirement |
Cost Sanity Check
For a 100K-input / 20K-output request:
| Model | Approx cost |
|---|---|
| Claude Sonnet 5 | $0.40 introductory / $0.60 standard |
| Claude Opus 4.8 | $1.00 |
| GPT-5.5 standard short context | $1.10 |
| GPT-5.5 standard long context | $1.90 |
| Claude Fable 5 | $2.00 |
| GPT-5.5 Pro short context | $6.60 |
If a task is routine, those deltas compound quickly. If a task is high-stakes and a better answer prevents a costly mistake, the premium can be rational.
What To Verify Before Committing Spend
- Does Sonnet already solve the task well enough?
- Does Opus improve the answer materially?
- Is Fable available through your target account, plan, cloud, and region?
- Do its retention, usage-credit, and guardrail terms fit the workload?
- Does 30-day retention fit your data policy?
- Does GPT-5.5 cached input or long-context pricing beat Claude for this workload?
- Can you measure cost per successful task, not just benchmark score?
Sources
- Anthropic: Redeploying Fable 5 (Archive)
- Anthropic: Claude Fable 5 and Claude Mythos 5 (Archive)
- Anthropic: Statement on the US government directive to suspend access to Fable 5 and Mythos 5 (Archive)
- WIRED: Anthropic Says It’s Taking Claude Fable 5 Offline to Comply With US Government Order (Archive)
- The Verge: Anthropic cuts off Fable 5 and Mythos 5 access following government order (Archive)
- Claude API docs: Fable/Mythos model introduction (Archive)
- Claude API docs: Pricing (Archive)
- Anthropic: Claude Sonnet 5 launch (Archive)
- Anthropic Platform: Sonnet 5 migration guide (Archive)
- OpenAI: API pricing (Archive)
- OpenAI: GPT-5.6 limited preview (Archive)
- OpenAI: GPT-5.6 Preview system card (Archive)
- WIRED: Anthropic Is Still at Odds With the White House Over Claude Fable 5 (Archive) — June 15: talks unresolved
- The Verge: Trump’s Anthropic shutdown just made the case for non-American AI (Archive) — June 15: sovereign AI reaction
- The Verge: Anthropic got hit by export rules nobody understands (Archive) — June 17: no clear statutory process
- Business Insider: An AI startup is suing the US government for taking away Anthropic’s new model (Archive) — June 24: reported Fable restoration behind nationality and onboarding controls
Related links
- Claude Fable 5 decision guide
- Claude Opus 4.8 baseline guide
- Budget Tier LLM Comparison — Models under $1/1M tokens
- Mid-Range Tier LLM Comparison — Models $1-$3/1M tokens
- Claude vs OpenAI pricing — Provider pricing head-to-head
- Smart Spend Guide — Spend strategy before premium escalation
Last verified: July 2, 2026. Fable 5 is restored on native Claude surfaces; Mythos 5 and GPT-5.6 remain restricted-access context. Pricing, included usage, cloud availability, retention, and model terms can change independently.